fdo#87155: Avoid negative scaling (and assertion failures further on)

Change-Id: I4a1a96b785ced4364a325ac19975d29771afe122
Reviewed-on: https://gerrit.libreoffice.org/13396Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>

sc/source/ui/view/output2.cxx

@@ -1722,7 +1722,7 @@ void ScOutputData::DrawStrings( bool bPixelToLogic )
                             long nAvailable = aAreaParam.maAlignRect.GetWidth() - nTotalMargin;
                             long nScaleSize = aVars.GetTextSize().Width();         // without margin
 
-                            if ( nScaleSize > 0 )       // 0 if the text is empty (formulas, number formats)
+                            if ( nAvailable > 0 && nScaleSize > 0 )       // 0 if the text is empty (formulas, number formats)
                             {
                                 long nScale = ( nAvailable * 100 ) / nScaleSize;