MFB (1.82.2.31.2.17.2.10): "Added a warning message on pdo::exec() failure in the event of an empty query"

ext/pdo/pdo_dbh.c

@@ -930,6 +930,7 @@ static PHP_METHOD(PDO, exec)
 	}
 
 	if (!statement_len) {
+		pdo_raise_impl_error(dbh, NULL, "HY000",  "trying to execute an empty query" TSRMLS_CC);
 		RETURN_FALSE;
 	}
 	PDO_DBH_CLEAR_ERR();