eksctl ignores ManagedNodeGroups (capital m) instead of producing an error

[alisade]

What happened?
eksctl ignores ManagedNodeGroups (capital m) instead of producing an error

What you expected to happen?
Error message

How to reproduce it?

~/environment $ cat /tmp/eks-configuration.yml                                                                                                                                                               
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: eksworkshop-eksctl
  region: us-west-2

ManagedNodeGroups:
  - name: eksworkshop-eksctl-ng1
    labels: { role: workers }
    instanceType: m5.large
    desiredCapacity: 3
    minSize: 3
    maxSize: 3
    ssh: 
      allow: true
    iam:
      withAddonPolicies:
        imageBuilder: true
        albIngress: true
        autoScaler: true
        appMesh: true
        xRay: true
        cloudWatch: true
        externalDNS: true

~/environment $ eksctl create nodegroup -f /tmp/eks-configuration.yml 
[ℹ]  eksctl version 0.10.2
[ℹ]  using region us-west-2
[ℹ]  will use version 1.14 for new nodegroup(s) based on control plane version
[ℹ]  1 nodegroup(s) that already exist (eksworkshop-eksctl-ng0) will be excluded
[ℹ]  combined exclude rules: eksworkshop-eksctl-ng0
[ℹ]  no nodegroups present in the current set were excluded by the filter
[ℹ]  1 task: { no tasks }
[✔]  created 0 nodegroup(s) in cluster "eksworkshop-eksctl"
[✔]  created 0 managed nodegroup(s) in cluster "eksworkshop-eksctl"
[ℹ]  checking security group configuration for all nodegroups
[ℹ]  all nodegroups have up-to-date configuration

Anything else we need to know?
downloaded binary, used api key/secret from ~/.aws/credentials

Versions
Please paste in the output of these commands:

~/environment $ eksctl version
[ℹ]  version.Info{BuiltAt:"", GitCommit:"", GitTag:"0.10.2"}

~/environment $ kubectl version
Client Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.3", GitCommit:"b3cbbae08ec52a7fc73d334838e18d17e8512749", GitTreeState:"clean", BuildDate:"2019-11-13T11:23:11Z", GoVersion:"go1.12.12", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14+", GitVersion:"v1.14.8-eks-41be3d", GitCommit:"41be3d46034bc1d637f82d35a6eee5df7efc5142", GitTreeState:"clean", BuildDate:"2019-11-20T17:19:16Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}

[martina-if]

See #1861 (comment)

For now I will close this since it's already tracked in #753