[PATCH 3 of 3 V3] convert/mtn: Avoid unnecessary initial test of mtn repo

[daniel.atallah at gmail.com]

# HG changeset patch
# User Daniel Atallah <daniel.atallah at gmail.com>
# Date 1301062426 14400
# Branch stable
# Node ID 3ce8f1e70bad2cd91c588ce4bc24310ae0c6d665
# Parent  0a2ee21d180173c5991a7203c8177e6af9f430b7
convert/mtn: Avoid unnecessary initial test of mtn repo

As soon as before() is called, we'll know if there is a problem (and get a
better error message).

diff --git a/hgext/convert/monotone.py b/hgext/convert/monotone.py
--- a/hgext/convert/monotone.py
+++ b/hgext/convert/monotone.py
@@ -20,6 +20,7 @@
         self.ui = ui
         self.path = path
         self.automatestdio = False
+        self.rev = rev
 
         norepo = NoRepo(_("%s does not look like a monotone repository")
                         % path)
@@ -65,14 +66,6 @@
 
         checktool('mtn', abort=False)
 
-        # test if there are any revisions
-        self.rev = None
-        try:
-            self.getheads()
-        except:
-            raise norepo
-        self.rev = rev
-
     def mtnrun(self, *args, **kwargs):
         if self.automatestdio:
             return self.mtnrunstdio(*args, **kwargs)