Fix lots of exception-related problems.
These have been around since the Big Code Split.
changeset: 0:acb14030fe0a
tag: tip
user: test
date: Thu Jan 1 00:00:00 1970 +0000
summary: test
changeset: 1:863197ef0378
tag: tip
user: test
date: Thu Jan 1 00:00:00 1970 +0000
summary: Added tag bleah for changeset acb14030fe0a21b60322c440ad2d20cf7685a376
changeset: 0:acb14030fe0a
tag: bleah
user: test
date: Thu Jan 1 00:00:00 1970 +0000
summary: test
abort: working copy of .hgtags is changed (please commit .hgtags manually)
failed