Fix helm default

[bplotnick-humane]

Why are these changes needed?

Introduced in #451. Without a default value, helm throws:

... error calling ne: incompatible types for comparison

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

[DmitriGekhtman]

@bplotnick-humane could you clarify what bug you encountered, and with what inputs to helm install?
I did not encounter any issues helm installing the default ray-cluster chart from master.

[bplotnick-humane]

You can repro this with: helm template . from within the kuberay/helm-chart/ray-cluster directory

[DmitriGekhtman]

You can repro this with: helm template . from within the kuberay/helm-chart/ray-cluster directory

Which commit are using locally (git rev-parse HEAD)?
I do not get an error with current master.

[kevin85421]

This issue will only happen in old helm versions. See #548 for more details. This issue and #537 #543 are duplicate. Thank @bplotnick-humane for pointing this out!