BUG: Incorrect license analysis for altcha

[pombredanne]

Describe the bug

• The "Ambiguous compound licensing" flag is set, even though there are no ambiguous licenses

To Reproduce
Steps to reproduce the behavior:

• Add package for https://files.pythonhosted.org/packages/cf/a8/8327d1b64e4961b2c762788efacd3a91d7f38d5bbb59a3393aa316aa95e2/altcha-0.1.9-py3-none-any.whl
• Wait for the scan to complete
• go to scan tab

Expected behavior
We should have high score on license clarity

Screenshots

Context (OS, Browser, Device, etc.):

[tdruez]

@pombredanne This Scan tab in DejaCode presents data as provided by ScanCode.io, and in this case, generated by ScanCode-toolkit.

To reproduce:

1. Fetch altcha-0.1.9-py3-none-any.whl
2. Extract the wheel

extractcode altcha-0.1.9-py3-none-any.whl

3. Scan with ScanCode

scancode --json-pp - --license --classify --summary --package altcha-0.1.9-py3-none-any.whl-extract

See the license_clarity_score values as provided in the scan results:

  "summary": {
    "declared_license_expression": "mit",
    "license_clarity_score": {
      "score": 0,
      "declared_license": false,
      "identification_precision": false,
      "has_license_text": false,
      "declared_copyrights": false,
      "conflicting_license_categories": false,
      "ambiguous_compound_licensing": true
    },

...

[AyanSinhaMahapatra]

This seems related to #3707