[BUG] statcache incorrectly assumes that cache has something in it.

[Aaron Bentley]

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baz2bzr is now failing after one revision, because all the files are too
new for the statcache, but the statcache assumes there's at least one file.

abentley at troll:~$ baz2bzr \
aaron.bentley at utoronto.ca--be/bugs-everywhere--devel--0 bzrbe
Traceback (most recent call last):

~  File "/home/abentley/bin/baz2bzr", line 310, in ?
~    import_version(output_dir, pybaz.Version(sys.argv[1]))
~  File "/home/abentley/bin/baz2bzr", line 189, in import_version
~    for result in iter_import_version(output_dir, version, tempdir):
~  File "/home/abentley/bin/baz2bzr", line 231, in iter_import_version
~    committer=log.creator, timestamp=timestamp, timezone=0)
~  File "/home/abentley/bzrtools/bzrlib/branch.py", line 554, in commit
~    commit(self, *args, **kw)
~  File "/home/abentley/bzrtools/bzrlib/commit.py", line 77, in commit
~    work_tree = branch.working_tree()
~  File "/home/abentley/bzrtools/bzrlib/branch.py", line 587, in
working_tree
~    return WorkingTree(self.base, self.read_working_inventory())
~  File "/home/abentley/bzrtools/bzrlib/workingtree.py", line 40, in
__init__
~    self._update_statcache()
~  File "/home/abentley/bzrtools/bzrlib/workingtree.py", line 97, in
_update_statcache
~    self._statcache = statcache.update_cache(self.basedir, self.inventory)
~  File "/home/abentley/bzrtools/bzrlib/statcache.py", line 208, in
update_cache
~    cache = load_cache(basedir)
~  File "/home/abentley/bzrtools/bzrlib/statcache.py", line 163, in
load_cache
~    text_sha = f[1]
IndexError: list index out of range
abentley at troll:~$
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