fix missing Parsing status message
fix missing Parsing status message

Summary:
we send parsing status updates each time get_next_files completes, but never send one when we start.

this makes the IDE show the stale previous status, like "starting up" or "reading saved state", until we've parsed the first 1000 files.

Reviewed By: gkz

Differential Revision: D22122807

fbshipit-source-id: 9278c2c23c471332f878be68aa743a318ad974aa

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow