Adding/Editing repositories doesn't have validation

To replicate:

A. Adding a repository
1. Click the Repositories link in the left navigation menu
2. Click the Add Repository link in the upper right part of the page
3. Enter invalid values in Identifier, Name, Directory or URL, empty Strings
4. Click the Add Repository button

Result: Repositories Administration page is displayed, no repository is added
Expected Result: Validation errors

B. Editing a repository
1. Click the Repositories link in the left navigation menu
2. Click the Edit Repository link in the same row as the repository's header
3. Enter invalid values in Name, Directory or URL, empty Strings and using default values for Type and Cron
4. Click the Update Repository button

Result: Repositories Administration page displayed, repository is updated
Expected Result: Validation errors