empty browser fix

1 files changed, 3 insertions, 2 deletions

diff --git a/tagit/widgets/browser.py b/tagit/widgets/browser.py
index 28f7440..8445706 100644
--- a/tagit/widgets/browser.py
+++ b/tagit/widgets/browser.py
@@ -171,7 +171,8 @@ class Browser(GridLayout, StorageAwareMixin, ConfigAwareMixin):
         """
         # get groups and their shadow (group's members in items)
         groups = defaultdict(set)
-        for obj, grp in reduce(operator.add, items).group(node=True, view=list):
+        all_items = reduce(operator.add, items, self.root.session.storage.empty(ns.bsfs.File))
+        for obj, grp in all_items.group(node=True, view=list):
             groups[grp].add(obj)
 
         # don't fold groups if few members
@@ -218,7 +219,7 @@ class Browser(GridLayout, StorageAwareMixin, ConfigAwareMixin):
                 unfolded |= self.folds[itm].shadow
             else:
                 unfolded |= {itm}
-        return reduce(operator.add, unfolded) # FIXME: What if items is empty?
+        return reduce(operator.add, unfolded, self.root.session.storage.empty(ns.bsfs.File))
 
     def neighboring_unselected(self):
         """Return the item closest to the cursor and not being selected. May return None."""