REPORT-50096 fix 预防npe

designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCDefPane.java

@@ -255,6 +255,9 @@ public class JDBCDefPane extends JPanel {
     }
 
     public JDBCDatabaseConnection update() {
+        if (jdbcDatabase == null) {
+            jdbcDatabase = new JDBCDatabaseConnection();
+        }
         Object driveItem = this.driverComboBox.getSelectedItem();
         jdbcDatabase.setDriver(driveItem == null ? null : driveItem.toString());
         jdbcDatabase.setURL(this.urlTextField.getText().trim());