small fix on channel update logic so that we update recipients even when there are no user-id based recipients in the update itself.
small fix on channel update logic so that we update recipients even when there are no user-id based recipients in the update itself.

dashkb/metabase,blueoceanideas/metabase,zoowii/metabase,zoowii/metabase,dashkb/metabase,zoowii/metabase,dashkb/metabase,dashkb/metabase,Endika/metabase,blueoceanideas/metabase,zoowii/metabase,blueoceanideas/metabase,zoowii/metabase,blueoceanideas/metabase,Endika/metabase,Endika/metabase,dashkb/metabase,Endika/metabase,Endika/metabase,blueoceanideas/metabase