Potential fix for code scanning alert no. 15: Useless null check

[InvalidDavid]

Potential fix for https://github.com/InvalidDavid/UMA/security/code-scanning/15

Remove the useless null-safe call and keep behavior unchanged by directly parsing the string and preserving the same fallback to 0L when parsing fails.

Best fix in this file region (getDetails, around lines 267–268):

• Keep dateStr assignment as-is.
• Replace:
  • val uploadDate = dateStr?.let { dateFormat.parseSafe(it) } ?: 0L
• With:
  • val uploadDate = dateFormat.parseSafe(dateStr) ?: 0L

This preserves existing functionality:

• If datetime is absent, attr("datetime") gives "".
• parseSafe("") should return null (same as failed parse), then ?: 0L applies exactly as before.

No imports, new methods, or dependencies are needed.

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