service2.js: Fix empty paragraph handling

service2.js

@@ -432,9 +432,9 @@ class BesDOMService extends BesTreeService {
       case Node.ELEMENT_NODE:
         if (this.isBlockElement(node)) {
           // Block elements are grammar-checked independently.
-          this.onProofing()
           let result = this.getProofing(node)
           if (result) {
+            this.onProofing()
             this.onProofingProgress(result.matches.length)
             return [{ text: `<${node.tagName}/>`, node: node, markup: true }]
           }
@@ -444,6 +444,7 @@ class BesDOMService extends BesTreeService {
             data = data.concat(this.proofNode(el2, abortController))
           if (data.some(x => !x.markup && !/^\s*$/.test(x.text))) {
             // Block element contains some text.
+            this.onProofing()
             const signal = abortController.signal
             fetch(
               new Request(besUrl + '/check', {
@@ -948,73 +949,78 @@ class BesPlainTextService extends BesService {
       paragraphRange.setEnd(nodes[nodeIdx].node, end - nodes[nodeIdx].start)
       while (nodeIdx < nodes.length && nodes[nodeIdx].end <= end) nodeIdx++
 
-      this.onProofing()
       let result = this.getProofing(paragraphRange)
       if (result) {
+        this.onProofing()
         this.onProofingProgress(result.matches.length)
         continue
       }
-      const signal = this.abortController.signal
-      fetch(
-        new Request(besUrl + '/check', {
-          method: 'POST',
-          headers: {
-            'Content-Type': 'application/x-www-form-urlencoded'
-          },
-          body: new URLSearchParams({
-            format: 'plain',
-            data: JSON.stringify({
-              annotation: [
-                {
-                  text: text.substring(start, end)
-                }
-              ]
-            }),
-            language: this.hostElement.lang ? this.hostElement.lang : 'sl',
-            level: 'picky'
-          })
-        }),
-        { signal }
-      )
-        .then(response => {
-          if (!response.ok) {
-            this.onFailedProofing(response)
-            throw new Error('Unexpected BesStr server response')
-          }
-          return response.json()
-        })
-        .then(responseData => {
-          let matches = []
-          responseData.matches.forEach(match => {
-            let matchRange = document.createRange()
-            let nodeIdx = 0,
-              matchStart = start + match.offset
-            while (nodeIdx < nodes.length && nodes[nodeIdx].end < matchStart)
-              nodeIdx++
-            matchRange.setStart(
-              nodes[nodeIdx].node,
-              matchStart - nodes[nodeIdx].start
-            )
-            let matchEnd = matchStart + match.length
-            while (nodeIdx < nodes.length && nodes[nodeIdx].end < matchEnd)
-              nodeIdx++
-            matchRange.setEnd(
-              nodes[nodeIdx].node,
-              matchEnd - nodes[nodeIdx].start
-            )
-            const { clientRects, highlights } =
-              this.addMistakeMarkup(matchRange)
-            matches.push({
-              rects: clientRects,
-              highlights: highlights,
-              range: matchRange,
-              match: match
+      let paragraphText = text.substring(start, end)
+      if (!/^\s*$/.test(paragraphText)) {
+        // Paragraph contains some text.
+        this.onProofing()
+        const signal = this.abortController.signal
+        fetch(
+          new Request(besUrl + '/check', {
+            method: 'POST',
+            headers: {
+              'Content-Type': 'application/x-www-form-urlencoded'
+            },
+            body: new URLSearchParams({
+              format: 'plain',
+              data: JSON.stringify({
+                annotation: [
+                  {
+                    text: paragraphText
+                  }
+                ]
+              }),
+              language: this.hostElement.lang ? this.hostElement.lang : 'sl',
+              level: 'picky'
             })
+          }),
+          { signal }
+        )
+          .then(response => {
+            if (!response.ok) {
+              this.onFailedProofing(response)
+              throw new Error('Unexpected BesStr server response')
+            }
+            return response.json()
           })
-          this.markProofed(paragraphRange, matches)
-          this.onProofingProgress(matches.length)
-        })
-        .catch(error => this.onFailedProofingResult(error))
+          .then(responseData => {
+            let matches = []
+            responseData.matches.forEach(match => {
+              let matchRange = document.createRange()
+              let nodeIdx = 0,
+                matchStart = start + match.offset
+              while (nodeIdx < nodes.length && nodes[nodeIdx].end < matchStart)
+                nodeIdx++
+              matchRange.setStart(
+                nodes[nodeIdx].node,
+                matchStart - nodes[nodeIdx].start
+              )
+              let matchEnd = matchStart + match.length
+              while (nodeIdx < nodes.length && nodes[nodeIdx].end < matchEnd)
+                nodeIdx++
+              matchRange.setEnd(
+                nodes[nodeIdx].node,
+                matchEnd - nodes[nodeIdx].start
+              )
+              const { clientRects, highlights } =
+                this.addMistakeMarkup(matchRange)
+              matches.push({
+                rects: clientRects,
+                highlights: highlights,
+                range: matchRange,
+                match: match
+              })
+            })
+            this.markProofed(paragraphRange, matches)
+            this.onProofingProgress(matches.length)
+          })
+          .catch(error => this.onFailedProofingResult(error))
+      }
     }
 
     this.onProofingProgress(0)