do not crash if ENV in CONF is None #3528
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What does this PR do?
If envvar is NoneType, we want to return the tags directly instead of crashing.
Motivation
Support case brought up by the community.
Testing Guidelines
Set up a DCOS cluster v 1.9.2, deployed the agent running 5.17.2 and witnessed the successful auto discovery of a redis container along with the collection of Mesos/Marathon specific tags.