Don't remove blank lines in commit messages

When parsing the commit messages, preserve any blank lines that are in
the message.

Signed-off-by: Kevin McConnell <kevin.mcconnell@gmail.com>

Author: Kevin McConnell

lib/git/commit.py

@@ -145,7 +145,7 @@ def list_from_string(cls, repo, text):
         Returns
             git.Commit[]
         """
-        lines = [l for l in text.splitlines() if l.strip()]
+        lines = [l for l in text.splitlines() if l.strip('\r\n')]
 
         commits = []