Bug 1196764 - Return early if max_start_timestamp was not found
Bug 1196764 - Return early if max_start_timestamp was not found

Which can occur when no jobs exist for that repository.

glenn124f/treeherder,KWierso/treeherder,wlach/treeherder,akhileshpillai/treeherder,avih/treeherder,tojonmz/treeherder,parkouss/treeherder,kapy2010/treeherder,avih/treeherder,tojon/treeherder,tojon/treeherder,KWierso/treeherder,sylvestre/treeherder,sylvestre/treeherder,tojonmz/treeherder,wlach/treeherder,tojon/treeherder,parkouss/treeherder,glenn124f/treeherder,kapy2010/treeherder,akhileshpillai/treeherder,KWierso/treeherder,parkouss/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,kapy2010/treeherder,avih/treeherder,parkouss/treeherder,wlach/treeherder,parkouss/treeherder,edmorley/treeherder,edmorley/treeherder,avih/treeherder,edmorley/treeherder,sylvestre/treeherder,glenn124f/treeherder,avih/treeherder,sylvestre/treeherder,edmorley/treeherder,akhileshpillai/treeherder,kapy2010/treeherder,KWierso/treeherder,wlach/treeherder,sylvestre/treeherder,wlach/treeherder,glenn124f/treeherder,sylvestre/treeherder,wlach/treeherder,avih/treeherder,akhileshpillai/treeherder,tojon/treeherder,glenn124f/treeherder,tojonmz/treeherder,tojonmz/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,kapy2010/treeherder,tojonmz/treeherder,parkouss/treeherder