fix issue if no affected references
Adding MIT License as discussed on list.
Revert "Adding MIT License as discussed on list."

This reverts commit 7166cd3e7eeec90f25724a1eafdbbe746bcf5ae2.
api: Require that X-TBA-App-Id be non-blank

This disallows headers like :: or a::
api: Add test cases for X-TBA-App-Id
Merge pull request #1033 from mc10/api

api: Require that X-TBA-App-Id be non-blank