Add ability to distinguish between when comments have zero replies, and when their reply tree wasn't built.

r2/r2/controllers/front.py

@@ -487,6 +487,11 @@ class FrontController(RedditController):
         listing = LinkListing(builder)
         pane = listing.listing()
 
+        # Indicate that the comment tree wasn't built for comments
+        for i in pane.things:
+            if hasattr(i, 'body'):
+                i.child = None
+
         return pane
 
     def _edit_modcontrib_reddit(self, location, num, after, reverse, count, created):

r2/r2/controllers/listingcontroller.py

@@ -708,7 +708,14 @@ class MessageController(ListingController):
         if (self.where == 'messages' and 
             (c.user.pref_threaded_messages or self.message)):
             return Listing(self.builder_obj).listing()
-        return ListingController.listing(self)
+        pane = ListingController.listing(self)
+
+        # Indicate that the comment tree wasn't built for comments
+        for i in pane.things:
+            if i.was_comment:
+                i.child = None
+
+        return pane
 
     def query(self):
         if self.where == 'messages':

r2/r2/lib/template_helpers.py

@@ -186,10 +186,15 @@ def replace_render(listing, item, render_func):
         style = style or c.render_style or 'html'
         replacements = {}
 
-        child_txt = ( hasattr(item, "child") and item.child )\
-            and item.child.render(style = style) or ""
-        replacements["childlisting"] = child_txt
-
+        if hasattr(item, 'child'):
+            if item.child:
+                replacements['childlisting'] = item.child.render(style=style)
+            else:
+                # Special case for when the comment tree wasn't built which
+                # occurs both in the inbox and spam page view of comments.
+                replacements['childlisting'] = None
+        else:
+            replacements['childlisting'] = ''
 
         #only LinkListing has a show_nums attribute
         if listing: