Handle exception on jinja template while having cache failure

[dzpt]

Due to #564 , if the debug is false in production, having cache system failure would ruin the whole app.
This is inconsistent compare to the exception handle in the @memoize decoration, which is allowed your app continue running even caching system (like redis) is down.

• fixes jinja caching won't have exception while having redis failure #564

Checklist:

• [ x] Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
• [ x] Add or update relevant docs, in the docs folder and in code.
• [ x] Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• [ x] Add .. versionchanged:: entries in any relevant code docs.
• [ x] Run pre-commit hooks and fix any issues.
• [ x] Run pytest and tox, no tests failed.