feat: keep modal open when saving database failed (#11618)

superset-frontend/src/utils/getClientErrorObject.ts

@@ -29,6 +29,8 @@ export type ClientErrorObject = {
   error: string;
   errors?: SupersetError[];
   link?: string;
+  // marshmallow field validation returns the error mssage in the format
+  // of { field: [msg1, msg2] }
   message?: string;
   severity?: string;
   stacktrace?: string;