Suppressed double hiding/deletion of caret which can cause the caret to go missing from a different window that's currently focused

src/stc/ScintillaWX.cpp

@@ -705,6 +705,8 @@ bool ScintillaWX::CreateSystemCaret() {
 
 bool ScintillaWX::DestroySystemCaret() {
 #ifdef __WXMSW__
+    if (sysCaretBitmap)
+    {
         ::HideCaret(GetHwndOf(stc));
         BOOL retval = ::DestroyCaret();
         if (sysCaretBitmap) {
@@ -712,6 +714,9 @@ bool ScintillaWX::DestroySystemCaret() {
             sysCaretBitmap = 0;
         }
         return retval != 0;
+    }
+    else
+        return false;
 #else
     return false;
 #endif