502 bad gateway after reporting a new issue on v34.0.0

[miketaylr]

I've redeployed v33.0.0, so we're good on that front. But we need to figure out what happened.

https://github.com/webcompat/webcompat.com/blob/master/CHANGELOG.md#3400---2020-06-16

[miketaylr]

@ksy36 discovered that any issue that was reported wasn't lost, it went to the right private repo, but the issue route is somehow busted (even for older issues)

[miketaylr]

It seems like it's throwing here:

ERROR in app: Exception on /issues/2497 [GET]#012Traceback (most recent call last):#012 File "./webcompat/templates/__init__.py", line 33, in get_checksum#012

Jun 16 19:27:59 staging-server webcompat-staging: FileNotFoundError: [Errno 2] No such file or directory: '/staging.webcompat.com/webcompat/static/dist/flashed-messages.e5.js'