Fix potential NPE when querying remote connection services.

It is possible that one of the remote connection services has unbound
during the query process.  Ensure that if this happens we do not attempt
to access its now-null service interface.

Test: Manual
Fixes: 74196849
Merged-In: I5b41395eb1e49e8addfa0bb41d13b97862988e1d
Change-Id: I5b41395eb1e49e8addfa0bb41d13b97862988e1d
(cherry picked from commit 2f89c32f)