Store empty (default) branch in branch cache, too.
Operations on this branch don't work otherwise.
Reading branches.cache had to be adjusted to allow an empty label.
Adjusted reading of the cache tip for symmetry, no functional change here.
adding a
adding b
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
the --branches option is deprecated, please use 'hg branches' instead
changeset: 0:b544c4ac4389
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 0
the --branch option is deprecated, please use 'hg branch' instead
Using head f4ac749470f2 for branch foo
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
changeset: 1:f4ac749470f2
tag: foo
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
adding c
the --branch option is deprecated, please use 'hg branch' instead
Using head f4ac749470f2 for branch foo
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
the --branches option is deprecated, please use 'hg branches' instead
changeset: 2:1505d56ee00e
tag: tip
parent: 0:b544c4ac4389
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 0.0
changeset: 1:f4ac749470f2
tag: foo
branch: foo
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1
2 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding d
the --branch option is deprecated, please use 'hg branch' instead
Using head f4ac749470f2 for branch foo
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
the --branches option is deprecated, please use 'hg branches' instead
changeset: 3:53b72df12ae5
tag: tip
parent: 0:b544c4ac4389
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 0.0
changeset: 1:f4ac749470f2
tag: foo
branch: foo
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1