Reset Template / No Template options don't always work
### Summary
the local options in Issue template dropdown don't work
### Steps to reproduce
- Create new issue
- Select "No template" from dropdown
### What is the current *bug* behavior?
`cannot read 'content' of undefined`
### Relevant logs and/or screenshots

### Output of checks
This bug happens on GitLab.com
### Possible fixes
### Design
- If the user selected a template and didn't edit it, and now selects "no template", it will remove all the contents.
- If the user selected a template and did edit it, and now selects "no tempalte", it will not remove all the contents.
as for dropdown value and focus:
- dropdown value: When you click on no template, I think its alright to have it changed to that value instead of “choose a template”
- focus: can we change the focus to the title if there has been no input for that yet.. if not it focusses the description? If that is not possible, i would rather have the focus change to the description imo
issue