Assertion now yields more useful information

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@540 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/rdiff_backup/increment.py

@@ -111,7 +111,7 @@ def get_inc(rp, typestr, time = None):
 	else:
 		dirname, basename = rp.dirsplit()
 		incrp = rp.__class__(rp.conn, dirname, (addtostr(basename),))
-	assert not incrp.lstat()
+	assert not incrp.lstat(), incrp
 	return incrp