coverity#705517 Dereference null return value

Change-Id: I797e302d71f45f618985fe2470a0428ff8452107

sw/source/core/uibase/app/docsh2.cxx

@@ -444,6 +444,7 @@ void SwDocShell::Execute(SfxRequest& rReq)
                     else
                         pTmpFrm = SfxViewFrame::GetFirst( this );
 
+                    if (pTmpFrm)
                         pTmpFrm->GetDispatcher()->Execute( nSlotId, 0, 0, SFX_CALLMODE_ASYNCHRON );
                 }