coverity#1427627 'Constant' variable guards dead code

Change-Id: I1b286dbacdcff35baf7c7802eec85859ae8e78c2
Reviewed-on: https://gerrit.libreoffice.org/48052Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/uitest/uiobject.cxx

@@ -708,6 +708,10 @@ void MultiLineEditUIObject::execute(const OUString& rAction,
             mxEdit->SetSelection(aSelection);
         }
     }
+    else
+    {
+        bHandled = false;
+    }
 
     if (!bHandled)
         WindowUIObject::execute(rAction, rParameters);