Save & Continue bypasses live validation

You can reproduce this issue on XWiki 8.2RC1 by following this steps:

1. Go to Administration > Content > Templates
2. Enter the name of a new template provider and click Create. This takes you to the edit mode for the new template provider
3. Click Save without filling any field
   • You will notice for a second that there is a validation error on the template name, which is mandatory, but the template provider is still saved nevertheless.
4. Edit the template provider
5. Click Save
   • You get the live validation message and the save operation is stopped
6. Click Save & Continue
   • The template provider is saved as indicated by the notification messages

Note that in step 3 the template provider is actually saved using Save & Continue operation (see XWIKI-12775) because there is a template specified on the URL and copying the template is done in a job so we show the progress while waiting for the create job to finish.