Fix null value secrets

[preetsshah]

Describe your changes :

We have been reported with an issue with the new helm chart (OMD app version - 1.2.3 and Chart version - 1.2.5)

Apparently, when the "hostIp" value is kept empty (or "") in the values.yaml file, the secrets template creates a null value secret for it which results in error while upgrading/installing the newer version of the helm chart.

With these changes, secret for hostIP won't be created unless it is non-empty.

Type of change :

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Checklist:

• I have read the CONTRIBUTING document.
• I have performed a self-review of my own.
• I have tagged my reviewers below.
• I have commented on my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• All new and existing tests passed.

Reviewers

@akash-jain-10