TT#33651 suppress warnings about undefined values

Reported at http://lists.sipwise.com/pipermail/spce-user_lists.sipwise.com/2019-December/014013.html

This can happen if the check for $data_ok above fails. The key will
still be present in %$keys but will be missing from %vals.

Change-Id: Ic8124c46c32f3f9cd59ff4d005866beb6e80547a

lib/NGCP/Cleanup.pm

@@ -745,9 +745,9 @@ SQL
                 my $meth = $vals{$key}->{meth};
 
                 # delete from cid map
-                $redis->srem("acc:cid::$cid", $key);
+                $redis->srem("acc:cid::$cid", $key) if defined $cid;
                 # delete from meth map
-                $redis->srem("acc:meth::$meth", $key);
+                $redis->srem("acc:meth::$meth", $key) if defined $meth;
             }
         } else {
             $self->error("insert into mysql: ".$DBI::errstr) if $DBI::err;