[PATCH] debugignore: catch the case when ignore.includepat doesn't exist

[Jason Harris]

# HG changeset patch
# User jfh <jason at jasonfharris.com>
# Date 1297765396 -46800
# Node ID 5e57c199848df186cd0b16476072831188ca41ed
# Parent  682edefe7dbbefabbd56090de40d04709af21edb
debugignore: catch the case when ignore.includepat doesn't exist

In testing of my recent addition of a debugignore command, some of my MacHg
users uncovered the exceptional case that if there is no ignore patterns of any
kind then a traceback occurred. Catch and fix this case.

diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -1355,7 +1355,10 @@
 def debugignore(ui, repo, *values, **opts):
     """display the combined ignore pattern"""
     ignore = repo.dirstate._ignore
-    ui.write("%s\n" % ignore.includepat)
+    if hasattr(ignore, 'includepat'):
+        ui.write("%s\n" % ignore.includepat)
+    else:
+        raise util.Abort(_("no ignore patterns found"))
 
 def debugindex(ui, repo, file_, **opts):
     """dump the contents of an index file"""