sw_redlinehide: SwFrame::IsCollapse() needs an extra check

Could be that the node is empty but the frame not.

Change-Id: I9b9af31f2ef9a6d862cfe38038222b5a46e6b0ab

sw/source/core/layout/calcmove.cxx

@@ -999,7 +999,8 @@ bool SwFrame::IsCollapse() const
 
     const SwTextFrame *pTextFrame = static_cast<const SwTextFrame*>(this);
     const SwTextNode *pTextNode = pTextFrame->GetTextNodeForParaProps();
-    return pTextNode && pTextNode->IsCollapse();
+    // TODO this SwTextNode function is pointless and should be merged in here
+    return pTextFrame->GetText().isEmpty() && pTextNode && pTextNode->IsCollapse();
 }
 
 void SwContentFrame::MakePrtArea( const SwBorderAttrs &rAttrs )