update_engagement checks

[Tim Donaworth]

dd-import/dd_import/dd_api.py

Line 98 in 6e572d7

 self.environment.commit_hash is not None: 

if self.environment.build_id is not None or \
           self.environment.commit_hash is not None or \
           self.environment.commit_hash is not None:

I believe the last check should be self.environment.branch_tag shouldn't it?