There is no notification displayed if the Bugzilla ticket isn't created, when Bugzilla resets their database

[Softvision-RemusDranca]

[Affected versions]:

• Firefox Release 66.0 and above
• Chrome 73.0.3683.75

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• Have an experiment "Ready for Sign-Off" on the "https://experimenter.stage.mozaws.net/" website.
• You are logged in your LDAP account on Experimenter stage website.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites and navigate to "https://experimenter.stage.mozaws.net/".
2. Open the experiment from prerequisites and click the "Ready for Sign-Off" button.
3. Refresh the page and observe the notifications displayed under the experiment's title.

[Expected result]:

• A notification that informs the user that Experimenter failed to create a Bugzilla Ticket for the experiment, is displayed.
• The "An email was sent to jkerim@mozilla.com about 'study name'" notification is displayed.

[Actual result]:

• There is no notification that informs the user that Experimenter failed to create a Bugzilla Ticket, displayed.
• Only the "An email was sent to jkerim@mozilla.com about 'study name'" notification is displayed.

[Notes]:

• This is an intermittent issue and it is only reproducible when Bugzilla resets their database which deletes the api key.
• When Experiment fails to create Bugzilla tickets in this situation, the operations failure is reported to Sentry.
• However, in a normal behavior the " Experimenter failed to create a Bugzilla Ticket for your experiment. Please contact an Experimenter Administrator on #ask-experimenter on Slack." notification is displayed when tickets aren't created.
• Attached is a screen recording of the issue:

[jaredlockhart]

Yes this is important we should display a notification to the user in all cases.

[jaredlockhart]

Here we should check if the id exists and if it doesn't we shoudl raise a bugzilla error:

https://github.com/mozilla/experimenter/blob/master/app/experimenter/experiments/bugzilla.py#L82

and that way we will catch and create the notification automatically here:

https://github.com/mozilla/experimenter/blob/master/app/experimenter/experiments/tasks.py#L74-L82

and to test this you can mimic the test that exists here:

https://github.com/mozilla/experimenter/blob/master/app/experimenter/experiments/tests/test_bugzilla.py#L48-L80

[Softvision-RemusDranca]

I have verified this issue and I was not able to reproduce it on Experimenter stage "https://stage.experimenter.nonprod.dataops.mozgcp.net" website. Tested on Windows 10x64, Mac 10.14 and Arch Linux 4.16.6 x64.