fix(DatabaseModal): filter pasted text in the select against supported DB values without errors

Author: EnxDev

superset-frontend/src/features/databases/DatabaseModal/index.tsx

@@ -1069,6 +1069,7 @@ const DatabaseModal: FunctionComponent<DatabaseModalProps> = ({
         // eslint-disable-next-line camelcase
         (db: DatabaseObject) => db.name === database_name,
       )[0];
+      if (!selectedDbModel) return;
       const {
         engine,
         parameters,