Return empty string instead of null for a single anonymous test

[sotojuan]

This fixes #487 by returning an empty string instead of null when there's just one anonymous test. This also keeps the behavior of printing [anonymous] when there are more than one anonymous tests.

[sotojuan]

Flaky Travis tests strike again?

[vadimdemedes]

Yeah, something is wrong with 0.10 build, I just had an issue with it too. Restarted yours.

[sindresorhus]

When there's no test title, instead of outputting an empty line, it should output nothing.

Right now it outputs the following:

❯ ava --verbose



  1 test passed

Notice that there are 3 empty lines above and only 2 below.

Instead it should only output 2 empty lines above:

❯ ava --verbose


  1 test passed

[sotojuan]

Returning an empty string does put an extra line there, and returning nothing (just return) gives an XO error. I opted to return undefined, which seems to get the job done (no extra line or extra output).

[vadimdemedes]

@sotojuan return null did not work?

[sotojuan]

null:

undefined:

'':