Update to exclude replicaSet parameter if empty

[luigizuccarelli]

@matzew Please review

Please refer to JIRA RHMAP-9817

[fh-automatron]

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[luigizuccarelli]

Retest this please

[luigizuccarelli]

@philbrookes - please review when you have a chance

[philbrookes]

:+1: This look good to me, I can't think of any parameters here that would ever need to be an empty string.

[luigizuccarelli]

@philbrookes - Thanks, when we set the envar MONGODB_REPLICA_NAME in the template to empty it sets replicaSet='' and causes this problem