coverity#1213147 Missing break in switch

Change-Id: Icafdcadb22da84d9f8cdb8928aa5e2c148993384

sw/source/filter/html/htmltab.cxx

@@ -4645,6 +4645,7 @@ void SwHTMLParser::BuildTableColGroup( HTMLTable *pCurTable,
         case HTML_TABLEROW_ON:
         case HTML_TABLE_OFF:
             SkipToken( -1 );
+            //fall-through
         case HTML_COLGROUP_OFF:
             bDone = true;
             break;