[Fix-4447] Fix null key returned for cache operation when adding database (#4473)

Author: aiwenmo

dinky-admin/src/main/java/org/dinky/controller/DataSourceController.java

@@ -81,7 +81,7 @@ public class DataSourceController {
      * @param dataBaseDTO {@link DataBaseDTO}
      * @return {@link Result}< {@link Void}>
      */
-    @CacheEvict(cacheNames = "metadata_schema", key = "#dataBaseDTO.id")
+    @CacheEvict(cacheNames = "metadata_schema", key = "#dataBaseDTO.id", condition = "#dataBaseDTO.id != null")
     @PutMapping("/saveOrUpdate")
     @Log(title = "Insert Or Update DataBase", businessType = BusinessType.INSERT_OR_UPDATE)
     @ApiOperation("Insert Or Update DataBase")