Fix git bz file of the last most recent commit

rev_list_commits() wasn't working properly when the returned list of
commits was empty because "".split("\n") is [""] not []. Special
case that. (Reported by Colin Walters.)

1 files changed, 4 insertions, 1 deletions

diff --git a/git-bz b/git-bz
index 1708554..7a0f40c 100755
--- a/git-bz
+++ b/git-bz
@@ -270,7 +270,10 @@ def rev_list_commits(*args, **kwargs):
     kwargs_copy = dict(kwargs)
     kwargs_copy['pretty'] = 'format:%s'
     output = git.rev_list(*args, **kwargs_copy)
-    lines = output.split("\n")
+    if output == "":
+        lines = []
+    else:
+        lines = output.split("\n")
     if (len(lines) % 2 != 0):
         raise RuntimeException("git rev-list didn't return an even number of lines")