tdf#73059 isDBReadOnly ensure connection before trying to retrieve it

Change-Id: I03f9b8ea72bd6906df61ccf05ead3670d7f90eb7
Reviewed-on: https://gerrit.libreoffice.org/14175Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Lionel Elie Mamane <lionel@mamane.lu>

dbaccess/source/ui/browser/sbagrid.cxx

@@ -989,6 +989,7 @@ bool SbaGridControl::IsReadOnlyDB() const
     if (xColumns.is())
     {
         Reference< XRowSet >  xDataSource(xColumns->getParent(), UNO_QUERY);
+        ::dbtools::ensureRowSetConnection( xDataSource, getContext(), false ); // NOT SURE ABOUT FALSE
         Reference< XChild >  xConn(::dbtools::getConnection(xDataSource),UNO_QUERY);
         if (xConn.is())
         {