Analyze 8-K tool bug fix

[harinlee83]

Reproducing the bug with the following query:

Analyze the latest 8-K for Apple for me

The analyze_8k tool call in its current form fails with the error

{
  "success": false,
  "error": "Failed to analyze 8-K: 'str' object has no attribute 'isoformat'"
}

This is because the edgartools package returns the date_of_report property as a string. So it needs to parsed back into a datetime object with datetime.strptime before converting to the desired isoformat.

The tool will also subsequently fail with this error at a later step

{
  "success": false,
  "error": "Failed to analyze 8-K: 'PressRelease' object is not iterable"
}

Again this depends on the implementation of the PressReleases class in edgartools but a quick fix was to wrap it with list(). Also noticed that PressRelease does not have a title property or attribute so I removed that.

With these proposed changes, the analyze_8k tool call works as expected.

[stefanoamorelli]

Thanks a lot for the contribution @harinlee83, LGTM ✔️

There's a failing linting issue, could you please have a look before merging?

[stefanoamorelli]

LGTM - just make sure to run the linter before merging.