[BUG] Empty metadata.annotations passes validation

[mikenikles]

I initially reported this at wasmCloud/wasmCloud#4481.

The following manifest passes validation, but fails at deploy time:

metadata:
  name: test
  annotations:

I was hoping that validate_manifest() (source) would report errors for the invalid manifest listed above.

[brooksmtownsend]

Oh yeah interesting @mikenikles , likely because we interpret that as an empty list of annotations which isn't technically an issue?

This is a bug and we should be able to fix this in the validate code 👍🏻