fix: add error handling for malformed timestamps in org-drill-entry-days-since-creation

Wrapped org-time-stamp-to-now call in condition-case to gracefully handle
malformed DATE_ADDED property values. Now returns nil instead of crashing
when encountering invalid timestamp formats.

Changes:
- Added condition-case around org-time-stamp-to-now (lines 2896-2898)
- Returns nil on error, allowing the function to fall through to other
  branches or return nil gracefully

This prevents unhandled errors in long-running sessions when drill entries
have corrupted or manually-edited timestamp values.

0 files changed, 0 insertions, 0 deletions