The rules for `wrangler:new_child_request` should not fail silently in the absence of a name attribute

[b1conrad]

From Phil:

Failing silently is tough on programmers. If we checked to ensure the name is present in the test rather than the eventex, then we could at least put in a log message.

Why do we require it? Why not just use random:word() to create a name when one isn’t provided?