[TT-7211] Fix headless templates

[komalsukhani]

Description

Validate redis and mongo fields are not nil before accessing it's child fields

Related Issue

TT-7211

Motivation and Context

Test Coverage For This Change

Installation was successful with empty mongo and redis fields.

Screenshots (if appropriate)

Types of changesmpaty m

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• Make sure you are requesting to pull a topic/feature/bugfix branch (right side). If PRing from your fork, don't come from your master!
• Make sure you are making a pull request against our master branch (left side). Also, it would be best if you started your change off our latest master.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[buraksekili]

It looks great considering the current problem that we faced.
We also use .Values.mongo and .Values.redis in different places, for instance in tyk-headless/gw-deployment. Should we add nil check to these as you did in the helpers? Or is it enough to add it to helpers?

[komalsukhani]

It looks great considering the current problem that we faced. We also use .Values.mongo and .Values.redis in different places, for instance in tyk-headless/gw-deployment. Should we add nil check to these as you did in the helpers? Or is it enough to add it to helpers?

Sorry I missed those cases. Will fix them