parents in commit has length 0

[gvangool]

When calling repo.get_recent_commits(), I get an error when it reaches the first commit.

In [1]: from pyvcs.backends import get_backend

In [2]: repo = get_backend('git').Repository('.')

In [3]: repo.get_recent_commits()
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)

/home/gvangool/dev/django-vcs-wiki/<ipython console> in <module>()

/home/gvangool/env/generic/lib/python2.6/site-packages/pyvcs/backends/git.pyc in get_recent_commits(self, since)
    101             pending_commits.extend(commit.parents)
    102         commits = filter(lambda o: datetime.fromtimestamp(o.commit_time) >= since, history.values())
--> 103         commits = map(lambda o: self.get_commit_by_id(o.id), commits)
    104         return sorted(commits, key=attrgetter('time'), reverse=True)
    105

/home/gvangool/env/generic/lib/python2.6/site-packages/pyvcs/backends/git.pyc in <lambda>(o)
    101             pending_commits.extend(commit.parents)
    102         commits = filter(lambda o: datetime.fromtimestamp(o.commit_time) >= since, history.values())
--> 103         commits = map(lambda o: self.get_commit_by_id(o.id), commits)
    104         return sorted(commits, key=attrgetter('time'), reverse=True)
    105

/home/gvangool/env/generic/lib/python2.6/site-packages/pyvcs/backends/git.pyc in get_commit_by_id(self, commit_id)
     80     def get_commit_by_id(self, commit_id):
     81         commit = self._get_commit(commit_id)
---> 82         files = self._diff_files(commit.id, commit.parents[0])
     83         return Commit(commit.id, commit.committer,
     84             datetime.fromtimestamp(commit.commit_time), commit.message, files,

IndexError: list index out of range

Easiest way to reproduce is create a new (git) repository and make a couple of commits.

[alex]

This issue is caused by trying to access the first commit in a repository. I'll have to think of the right way to solve this as we still want to have a correct diff.