fix the rising page for /r/all and for multi-reddits

r2/r2/lib/rising.py

@@ -64,4 +64,7 @@ def get_rising(sr):
     #get the sr_ids
     sr_ids = sr.rising_srs()
     rising = cache.get('rising') or ()
-    return [p[0] for p in filter(lambda pair: pair[1] in sr_ids, rising)]
+    if sr_ids:
+        return [p[0] for p in filter(lambda pair: pair[1] in sr_ids, rising)]
+    else:
+        return [p[0] for p in rising]

r2/r2/models/subreddit.py

@@ -523,6 +523,9 @@ class AllSR(FakeSubreddit):
             q._filter(queries.db_times[time])
         return q
 
+    def rising_srs(self):
+        return None
+
 
 class DefaultSR(FakeSubreddit):
     #notice the space before reddit.com
@@ -577,6 +580,10 @@ class MultiReddit(DefaultSR):
     def get_links(self, sort, time):
         return self.get_links_sr_ids(self.sr_ids, sort, time)
 
+    def rising_srs(self):
+        return self.sr_ids
+
+
 class SubSR(FakeSubreddit):
     stylesheet = 'subreddit.css'
     #this will make the javascript not send an SR parameter