No error message after entering incomplete information in Bitbucket Server Import

Summary

Submitting an incomplete form on the Bitbucket Server Import page only causes a page reload, no error messages will be shown.

Steps to reproduce

1. Open the Bitbucket Server Import
2. Click on List your Bitbucket Server repositories without entering any information

What is the current bug behavior?

The page reloads without any error messages.

What is the expected correct behavior?

The page reloads with error messages that describe how to correctly enter the necessary information.