When convo is set as important, only bubble if it can

Previously we called this code regardless of the entry
having bubble metadata or not, this is incorrect & had
the side effect of collapsing the shade when it shouldn't.

Test: manual - mark conversation without bubble metadata
      as important, note the shade doesn't collapse.
Fixes: 177566866
Change-Id: I5eee9ac7bc9b3d2e4abb7ea171d6263007fe68a6