[Exclusions] Missing fail is a fail

[jeremyk-91]

Goals (and why):
Not have too many errorprone exclusions. This one is very low risk - in general in a test if you have

try {
  bla();
} catch (ExceptionT e) {
  // expected
}

this will pass even if no exception is thrown. However, there are cases where not throwing is legit (see the suppression).

Implementation Description (bullets):

• Add fail() where it should be
• Add suppression

Testing (What was existing testing like? What have you done to improve it?):
Not much.

Concerns (what feedback would you like?):

• Is the suppression correct?

Where should we start reviewing?: eh, it's small

Priority (whenever / two weeks / yesterday): whenever

[Jolyon-S]

4:1