make test-coverage always succeeds

[vmarkovtsev]

make test-coverage never errors, even if the tests failed to build. Expected behavior: in case of any error, abort make and set the exit code, as all the normal build targets do.

This is especially funny when you realize that the test suite never actually ran after a few weeks.

[smola]

@vmarkovtsev Is this still happening? Could you share more info about the project where this is happening? Do you have a link to an example build on Travis CI exhibiting this problem?

[vmarkovtsev]

I will be able to recover on Monday.

[vmarkovtsev]

Link: https://ci.appveyor.com/project/mcuadros/client-go/build/5#L61

I don't see it in the recent builds, so maybe the cause of that particular error was fixed. I am not sure that the ignoring behavior is still present.