[Fix] no-cycle: create must *always* return an object, even if no listeners

[ljharb]

This is breaking eslint-plugin-airbnb's tests, and will break on any linting that's done on piped-in text.

cc @sharmilajesupaul @not-an-aardvark

[coveralls]

Coverage remained the same at 96.47% when pulling 19fc3df on ljharb:fix_no_cycle into ee15fa4 on benmosher:master.

[benmosher]

There are a handful of other return cases in this rule; do those need to be returning objects as well? I am unfamiliar with this requirement.

[ljharb]

The other cases are inside a nested function; there’s only 2 returns inside create.

[benmosher]

ohhhhh right. gosh, it really has been forever since I've done anything with this, I totally forgot that create is returning a object of node visitors. LGTM