The code for patch view assumed the current commit would always have a parent,
which made cgit segfault when that wasn't the case.
This fixes the bug and adds a test-script for patch view which includes a test
for the inital commit.
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
The new view mimics the output from `git format-patch`, making it possible
to cherry-pick directly from cgit with something like `curl $url | git am`.
Inspired by a patch to `git-apply` by Mike Hommey:
http://thread.gmane.org/gmane.comp.version-control.git/67611/focus=67610
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
