Related: rhbz#1255200 apparent missing stylesheet

Change-Id: Ice9a860ca839d37308b5c2f2eb639852fefe1d15
(cherry picked from commit dcb0738b)
Reviewed-on: https://gerrit.libreoffice.org/18240Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

svx/source/table/tablecontroller.cxx

@@ -1081,7 +1081,11 @@ void SvxTableController::SetTableStyle( const SfxItemSet* pArgs )
                     {
                         SfxItemSet aSet( xCell->GetItemSet() );
                         bool bChanges = false;
-                        const SfxItemSet& rStyleAttribs = xCell->GetStyleSheet()->GetItemSet();
+                        SfxStyleSheet *pStyleSheet = xCell->GetStyleSheet();
+                        SAL_WARN_IF(!pStyleSheet, "svx", "no stylesheet for table cell?");
+                        if (pStyleSheet)
+                        {
+                            const SfxItemSet& rStyleAttribs = pStyleSheet->GetItemSet();
 
                             for ( sal_uInt16 nWhich = SDRATTR_START; nWhich <= SDRATTR_TABLE_LAST; nWhich++ )
                             {
@@ -1091,6 +1095,7 @@ void SvxTableController::SetTableStyle( const SfxItemSet* pArgs )
                                     bChanges = true;
                                 }
                             }
+                        }
 
                         if( bChanges )
                         {