rss: protect against nil field

This happens when the filter tries to wrap a non-existing field, and in
custom filters it's probably a sign that the wrong field are being
accessed. It would probably be nicer to raise a warning about this, but
I'm too lazy to add that now.

1 files changed, 1 insertions, 1 deletions

diff --git a/data/rbot/plugins/rss.rb b/data/rbot/plugins/rss.rb
index b2d367b0..f7e559f7 100644
--- a/data/rbot/plugins/rss.rb
+++ b/data/rbot/plugins/rss.rb
@@ -392,7 +392,7 @@ class RSSFeedsPlugin < Plugin
           # do nothing
         else
           warning "ignoring #{v.inspect} wrapping of unknown class"
-        end
+        end unless ss[nk].nil?
       else
         subs[k] = v
       end