Refactor some compound conditionals on services

[lurraca]

Very small refactor of some compound conditionals in /services.

• Moving compound conditional into named method, with a higher level concept name

• Using the safe navigator instead of nil or false check.

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[cfdreddbot]

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/158918860

The labels on this github issue will be updated when the story is started.

[Samze]

LGTM, SAPI team will merge.