According to Issue #1331, the map filter doesn't allow values like [],{},(),None etc ( that automatically default to False ) to be set as the value to the default argument. The user can now set False values to the default argument of the map filter in Jinja2.

• fixes map filter: can't use a false, '', None, [], {} as default (or anything that is automatically cast to false) #1331

Checklist:

• Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
• Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• Run pre-commit hooks and fix any issues.
• Run pytest and tox, no tests failed.