Tolerate invalid enumeration values

[paulwarren-wk]

Reason for change

Fixes #612

Description of change

If an enumeration value is syntactically invalid, don't attempt to treat it is a QName, but instead set the err property on the fact data, so that "invalid value" is displayed in the fact inspector.

Steps to Test

Test document on #612.

• Viewer can now be created without error for this document.
• Check both DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration facts:
  • First should say "invalid value"
  • Second should work correctly, and display a label from the taxonomy.

review: @Arelle/arelle @paulwarren-wk

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure

• Verify aviary.yaml coverage of security relevant code

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