fix(datainsights): prevent TypeError when other_modes is None

[sentry]

This PR addresses issue DALGO-BACKEND-22D by adding None guards for the other_modes field in the parse_results methods for both string and numeric type insights.

Previously, if the database returned None for other_modes (e.g., when no additional modes exist), a TypeError: 'NoneType' object is not iterable would occur during list comprehension.

The fix involves changing result[0]["other_modes"] to (result[0]["other_modes"] or []) in:

• ddpui/core/datainsights/insights/string_type/queries.py (line 248)
• ddpui/core/datainsights/insights/numeric_type/queries.py (line 127)

This ensures that the list comprehension always iterates over an iterable (an empty list if other_modes is None), preventing the TypeError.

Fixes DALGO-BACKEND-22D

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.26%. Comparing base (11a5843) to head (4d2fc62).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1416   +/-   ##
=======================================
  Coverage   60.26%   60.26%           
=======================================
  Files         146      146           
  Lines       17222    17222           
=======================================
  Hits        10378    10378           
  Misses       6844     6844           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.