redact inception date from investpy when incorrect

[sandsmichael]

Description

• Summary of the change / bug fix.
  Redact Inception Date from Investpy and replace it with NA in instances where the result appears as a decimal instead of date type.

• Link # issue, if applicable.
  [Bug] Funds/info - Inception Date field does not return a date for some funds, instead displays an unknown integer. [Bug] Funds/info - Inception Date field does not return a date for some funds, instead displays an unknown integer. #2469
  [Bug] Funds/info - Inception Date field does not return a date for some funds, instead displays an unknown integer. #2469

• Screenshot of the feature or the bug before/after fix, if applicable.

• Relevant motivation and context.

• List any dependencies that are required for this change.
  None

How has this been tested?

Locally on my machine

• Please describe the tests that you ran to verify your changes.
  Replicated original bug report steps with different funds.
• Provide instructions so we can reproduce.

funds
load gtapx
info

• Please also list any relevant details for your test configuration.

Checklist:

• Update our Hugo documentation following these guidelines.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding scripts file.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My code passes all the checks pylint, flake8, black, ... To speed up development you should run pre-commit install.
• New and existing unit tests pass locally with my changes. You can test this locally using pytest tests/....

[sandsmichael]

#2469

[sandsmichael]

@jmaslek @deeleeramone Any tips on adding a label to this PR to pass the tests? Not seeing anything in the readme guide.

[jmaslek]

Not a fan of the nan. Maybe lets replace with a "-"

[DidierRLopes]

Thank you @sandsmichael !!