Bugfix: Input Datatime config schema

[cdce8p]

Description:

Has_at_least_one_key_value only works if parameter are optional

Example entry for configuration.yaml (if applicable):

input_datetime:
  both_date_and_time:
    name: Input with both date and time
    has_date: true
    has_time: true
  only_date:
    name: Input with only date
    has_date: true
  only_time:
    name: Input with only time
    has_time: true

Checklist:

• The code change is tested and works locally.

[tinloaf]

I don't see how has_at_least_one_key_value should only work on optional arguments, but of course these could be made optional.

[tinloaf]

Please set the default to False. Otherwise, None is being passed around instead of False, which of course works just as False in if self._has_date, but gives you strange values in the attributes. Also, yay for type safety.

[cdce8p]

@tinloaf It would work on required parameters as well, but than voluptuous catches it first if not given.

[tinloaf]

I just saw that https://home-assistant.io/components/input_datetime/ already listed the parameters as being optional. Thanks for catching this!