Warning during install: Skipped value for affinity: Not a table

[borigas]

Describe the bug
I get a warning coalesce.go:160: warning: skipped value for affinity: Not a table. when trying to install with affinity set in my values file

Version of Helm and Kubernetes:
Helm: 3.2.1
Kubernetes: 1.17.5

What happened:
When installing, I get a warning: coalesce.go:160: warning: skipped value for affinity: Not a table. Warnings cause my deployment pipeline to abort, so I need to get this fixed

What you expected to happen:
The helm install should succeed without warnings

How to reproduce it (as minimally and precisely as possible):

Create repro.yaml:

couchdbConfig:
  couchdb:
    uuid: 123

affinity:
  podAntiAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
            - key: "app"
              operator: In
              values:
              - couchdb
        topologyKey: "kubernetes.io/hostname"

Then run helm install my-name couchdb/couchdb -f repro.yaml

Anything else we need to know:
It seems to be tied to having affinity: defined in values.yaml without any children. If I comment out this line, the release succeeds without errors and creates the affinity

couchdb-helm/couchdb/values.yaml

Line 87 in deb055f

affinity:

I know this isn't the only place that a key is defined without children though, so I'm trying to figure out if there's a better way.