1.2.1dev: Adapt default value to Jinja2 requirements
1.2.1dev: Adapt default value to Jinja2 requirements

Refs #12639.


git-svn-id: 68cfa85dc440743b03ced815f1f2f5f2381a3d7a@15714 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac