diff -r 7ada598941d2 -r 27d6956d386b mercurial/changegroup.py
--- a/mercurial/changegroup.py	Wed Apr 24 09:32:29 2019 -0700
+++ b/mercurial/changegroup.py	Mon May 15 00:12:19 2017 -0700
@@ -1061,7 +1061,7 @@
         while tmfnodes:
             tree, nodes = tmfnodes.popitem()
 
-            should_visit = self._matcher.visitdir(tree[:-1] or '.')
+            should_visit = self._matcher.visitdir(tree[:-1])
             if tree and not should_visit:
                 continue
 
@@ -1093,7 +1093,7 @@
                 fullclnodes=self._fullclnodes,
                 precomputedellipsis=self._precomputedellipsis)
 
-            if not self._oldmatcher.visitdir(store.tree[:-1] or '.'):
+            if not self._oldmatcher.visitdir(store.tree[:-1]):
                 yield tree, deltas
             else:
                 # 'deltas' is a generator and we need to consume it even if