don't error when azure vars not set

[jklegar]

Signed-off-by: Jacob Klegar jacob@tecton.ai

What this PR does / why we need it: bugfix - config.get() errors when the variable is not set

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jklegar, oavdeev
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[feast-ci-bot]

@jklegar: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
test-end-to-end-sparkop	2e9267e	link	/test test-end-to-end-sparkop
test-end-to-end-aws	2e9267e	link	/test test-end-to-end-aws
test-end-to-end-azure	2e9267e	link	/test test-end-to-end-azure

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[jklegar]

/kind bug