Removed the call to _trackError in expand.  The call is not necessary because the call to the query inside of renderQuery is wrapped by _trackError.  The tree-expand-promise test now verifies the error event is being generated and I added additional tests for grids that do not have an implementation of renderQuery.
tree-expand-promise tests: Fix typos and phrasing of assertions
tree-expand-promise tests: Clean out unnecessary this.async usage
tree-expand-promise tests: Add another error event check

This currently fails because _trackError is not being called anywhere
on the renderArray (no-renderQuery) path.