wxUpdCheckThread::DownloadUpdatePackage() does the file-existence check before calculating hash, to avoid unnecessary warning in the log

Updater/src/chkthread.cpp

@@ -394,7 +394,8 @@ bool wxUpdCheckThread::ReadUpdatePackageMeta()
 
 bool wxUpdCheckThread::DownloadUpdatePackage()
 {
-    // Calculate file hash (if exists).
+    if (wxFileExists(m_fileName)) {
+        // Calculate file hash.
         wxCryptoHashSHA1 ch(*m_cs);
         if (ch.HashFile(m_fileName)) {
             wxMemoryBuffer buf;
@@ -408,6 +409,7 @@ bool wxUpdCheckThread::DownloadUpdatePackage()
                 return true;
             }
         }
+    }
 
     wxFFile file(m_fileName, wxT("wb"));
     if (!file.IsOpened()) {