Also added bug-capturing in build tool for conversion errors

nw/gui/build.py

@@ -476,6 +476,7 @@ class GuiBuildNovel(QDialog):
             noteRoot &= tItem.itemType == nwItemType.ROOT
             noteRoot &= tItem.itemClass != nwItemClass.NOVEL
 
+            try:
                 if noteRoot:
                     # Add headers for root folders of notes
                     makeHtml.addRootHeading(tItem.itemHandle)
@@ -493,6 +494,15 @@ class GuiBuildNovel(QDialog):
                     self.htmlText.append(makeHtml.getResult())
                     self.nwdText.append(makeHtml.getFilteredMarkdown())
 
+            except Exception as e:
+                logger.error("Failed to generate html of document '%s'" % tItem.itemHandle)
+                logger.error(str(e))
+                self.docView.setText((
+                    "Failed to generate preview. "
+                    "Document with title '%s' could not be parsed."
+                ) % tItem.itemName)
+                return False
+
             # Update progress bar, also for skipped items
             self.buildProgress.setValue(nItt+1)