Added --allow-empty to "be commit"

Previously many backends would silently add an empty commit.  Not very
useful.  When the new --allow-empty flag and related allow_empty
options are false, every versioning backend is guaranteed to raise the
EmptyCommit exception in the case of an attempted empty commit.

1 files changed, 4 insertions, 2 deletions

diff --git a/libbe/cmdutil.py b/libbe/cmdutil.py
index bba3e0e..853a75a 100644
--- a/libbe/cmdutil.py
+++ b/libbe/cmdutil.py
@@ -73,8 +73,10 @@ def get_command(command_name):
 def execute(cmd, args):
     enc = encoding.get_encoding()
     cmd = get_command(cmd)
-    cmd.execute([a.decode(enc) for a in args])
-    return 0
+    ret = cmd.execute([a.decode(enc) for a in args])
+    if ret == None:
+        ret = 0
+    return ret
 
 def help(cmd=None, parser=None):
     if cmd != None: