Incorrect error message when app has no handlers.

[jmalloc]

✗ record a specific 'event.FriendRequestSent' event

  | EXPLANATION
  |     no relevant handler types were enabled
  | 
  | SUGGESTIONS
  | 

It's not that the handler type was disabled, there simply were none (aggregate, in this case).

[jmalloc]

This seems to occur when there are no handlers that consume the command type at all.

[jmalloc]

Might relate to #66

[jmalloc]

This also seems pretty close to #65, which may be out of date, or perhaps there are two subtly different problems here.

[jmalloc]

@danilvpetrov Do you remember how this was happening? I can't seem to reproduce it in tests.

I get a panic instead:

 Test Panicked
    the fixtures.MessageA message type is not consumed by any handlers

[jmalloc]

Ok, I was able to reproduce this with [email protected] and [email protected], which is what we were using when pair programming in the "friends" domain, the panic added in PR #49 prevents this behavior in current versions of testkit.