refactor: 优化一下

backend/src/main/java/io/dataease/datasource/provider/JdbcProvider.java

@@ -204,6 +204,7 @@ public class JdbcProvider extends DatasourceProvider {
         }
 
         String queryView = getViewSql(datasourceRequest);
+        if(queryView != null){
             try (Connection con = getConnectionFromPool(datasourceRequest); Statement statement = con.createStatement(); ResultSet resultSet = statement.executeQuery(queryView)){
                 while (resultSet.next()) {
                     tables.add(resultSet.getString(1));
@@ -211,6 +212,8 @@ public class JdbcProvider extends DatasourceProvider {
             } catch (Exception e) {
                 DataEaseException.throwException(e);
             }
+        }
+
         return tables;
     }