update release date for 0.8.10
Add a default for request.args.get

And, just for the heck of it, catch TypeError anyway.  Fixes #3107.
Merge pull request #1441 from djmitche/bug3107

Add a default for request.args.get
reproduce Bug #3112
when listdir returns no files, clone

Fixes #3112.
Merge djmitche/buildbot:bug3112 (PR #1447)