Inconsistent SlackObjectFormationError raising when empty text is provided.

Given the following:

>>> SectionBlock(text="").to_dict()
SlackObjectFormationError: text or fields attribute must be specified

This is all correct enough and good enough. What's happening behind the scenes appears to be that TextObject.parse is used and does a truthy test on the incoming text, and returns None as opposed to an empty string.

Where that begins to go wrong, is here:

>>> SectionBlock(text=MarkdownTextObject(text="")).to_dict()
{'text': {'type': 'mrkdwn'}, 'type': 'section'}

Slack will reject that as erroneous. If it's sent back as part of the acknowledgement response as a response_action we won't necessarily see (receive) an error related to failing to parse the JSON schema. Slack's block kit builder says of it: Missing required field: text

Category

• slack_sdk.models (UI component builders)

Desired outcome

Ideally, I'd like to be able to trust (more) that the validation present in slack_sdk is going to raise on invalid configurations early, and consistently -- that is, where possible I'd like to assume that putting together something "empty" even if I've opted to use the classes instead of an equivalent base type (str, dict) should raise.