Validation is not triggered on page load

[yankedev]

When loading an event form DB for edit, if there is any field not valid, the save button is disabled but the field is not marked with the red border.

To discover the invalid field you can use command $('.ng-invalid') browser console

The error is reproducible with the current test data because the test event do not have https in the imageUrl.
Steps to reproduce it:

1. Start the application with mvn jetty:run
2. Go to http://localhost:8080/admin/
3. see the console log for the admin user password
4. edit the "eventname" event
5. The save button is disabled