A few fixes

[rbren]

This PR fixes https://github.com/FairwindsOps/reckoner/issues/690 and https://github.com/FairwindsOps/reckoner/issues/689, as well as an issue handling errors with templating

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR?

fix the issue above

What changes did you make?

• handled an err that wasn't being returned
• switched to helm dependency build instead of helm dependency update

What alternative solution should we consider, if any?

[CLAassistant]

All committers have signed the CLA.

[rbren]

I can't repro https://github.com/FairwindsOps/reckoner/issues/689 locally sadly. Let's see if this fixes it

[rbren]

actually pretty clear what the issue is, fixed it