Use get method when checking REQUEST_ID_HASH.
Use get method when checking REQUEST_ID_HASH.

This will prevent unit tests from blowing up when not set.
Resolves issue #53.

beaulyddon-wf/furious,mattsanders-wf/furious,rosshendrickson-wf/furious,mattsanders-wf/furious,rosshendrickson-wf/furious,Workiva/furious,beaulyddon-wf/furious,andreleblanc-wf/furious,Workiva/furious,andreleblanc-wf/furious