Shorten conditional to a simple truthiness check

As pointed out by Greg in code review, a simple truthiness check would
likely suffice in this situation since we never expect `method` to be
falsey.

Change-Id: Ifb1d50e6c1fae8b48c3865d595f78f50392af57f
Reviewed-on: https://gerrit.causes.com/22941
Reviewed-by: Aiden Scandella <aiden@causes.com>
Tested-by: Joe Lencioni <joe.lencioni@causes.com>