someone seems to forgot conditional which causes failure when using o…

[zoza1982]

…penstack

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What this PR does / why we need it:
Someone forgot conditional which causes failure

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
no

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[zoza1982]

Signed up with CLA per instructions.

[zoza1982]

This conditional used to be there in previous releases which now causes failure.

[Miouge1]

Based on Ansible Lint rule 602, foo and foo != "" should be equivalent conditions.

[woopstar]

Based on Ansible Lint rule 602, foo and foo != "" should be equivalent conditions.

What if you do openstack_cacert: "" - then it's actually defined, but with an empty string?