Allow to use --print with full review request URL
Review Request #11381 — Created Jan. 14, 2021 and discarded
rbt 2.0 introduced the possibility to provide the review request number as full URL. But this wasn't possible for --print option. rbt patch --print https://reviewboard/r/12345 ERROR: Unable to find a Review Board server for this source code tree. This change allows the usage, too.
Tried rbt patch --print https://reviewboard/r/12345 after fix
and saw that is printed the diff to stdout.
Tried rbt patch --print 12345 without repository and saw
that the error from above.