in KubernetesPodOperator the name parameter is mandatory.
However if you forget to add it you will get a broken dag message with:
![Screen Shot 2021-04-12 at 12 16 58](https://user-images.githubusercontent.com/62940116/114373136-f699d180-9b8a-11eb-8500-d8e7118650ae.png)

This is because
https://github.com/apache/airflow/blob/1dfbb8d2031cb8a3e95e4bf91aa478857c5c3a85/airflow/providers/cncf/kubernetes/operators/kubernetes_pod.py#L277

it calls validate_data which produce this error:
https://github.com/apache/airflow/blob/1dfbb8d2031cb8a3e95e4bf91aa478857c5c3a85/airflow/utils/helpers.py#L40

The error is not useful. It doesn't explain what the issue is of where the problem is. it also says problem with `key` which isn't a parameter of anything.
I couldn't even know that the issue is from the KubernetesPodOperator.

Suggestions:
make better error message for `KubernetesPodOperator` when name parameter is missing OR invalid.

I would also suggest to make validate_key produce a better error message specifying what object produce the error
tests/providers/cncf/kubernetes/operators/test_kubernetes_pod.py
name_base = 'test'
        affinity = {
            'nodeAffinity': {
                'preferredDuringSchedulingIgnoredDuringExecution': [
                    {
                        "weight": 1,
                        "preference": {
                            "matchExpressions": [{"key": "disktype", "operator": "In", "values": ["ssd"]}]
                        },
                    }
                ]
            }
        }
        k = KubernetesPodOperator(