SACGF / SACGF/variantgrid

limit_length_with_tooltip: 'object of type NoneType has no len()' (missing None guard)

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Description

🤖 Written by Claude

The `limit_length_with_tooltip` template tag does `if limit and len(text)` with no guard for `text` being `None`, raising `TypeError: object of type 'NoneType' has no len()`. The sibling function at line 86 already guards with `and text`.

Crashes the classification grouping detail page (sharianttest). One-line fix.

Location: `uicore/templatetags/js_tags.py:94`

**Rollbar:**
- https://app.rollbar.com/a/jimmy.andrews/fix/item/VariantGrid/7170

_(Filed from a 6-month Rollbar triage.)_

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