Add tests for when there is an error with the certificate being passed (no certificate, invalid certificate, PEM to DER error, parsing error).

I think this is the same as https://bugzilla.mozilla.org/show_bug.cgi?id=1566129

Pushed by csabou@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/58afdd441a45
Adds test for displaying error section. r=johannh

Backed out changeset 58afdd441a45 (bug 1568972) for bc failures at browser_aboutcertificateviewer.js.

Backout: https://hg.mozilla.org/integration/autoland/rev/429dbbd11067d097c0e8b6abc84c7a3ee1cfb52b

Push that started the failures: https://treeherder.mozilla.org/#/jobs?repo=autoland&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&revision=58afdd441a452f4e4dbcdc6245e6defd41bdabb5&selectedJob=261153366

Failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=261153366&repo=autoland&lineNumber=6155

https://treeherder.mozilla.org/#/jobs?repo=try&selectedJob=261174425&revision=3d172bb5a590c4fb437506dac4446651a50d0d44 should be fixed now - that test is now passing.

Pushed by csabou@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/168b4675c975
Adds test for displaying error section. r=johannh

This was backed out with a set of changes but ready to be landed now.

Pushed by nbeleuzu@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/ae02140f6e05
Adds test for displaying error section. r=johannh

https://hg.mozilla.org/mozilla-central/rev/ae02140f6e05