Fix bug in template with attribute values : they are always strings, so for value-less attributes (eg "checked" for radio buttons), test values "False" and "True" as strings, not booleans.
Fix bug in template with attribute values : they are always strings, so for value-less attributes (eg "checked" for radio buttons), test values "False" and "True" as strings, not booleans.

kikocorreoso/brython,brython-dev/brython,brython-dev/brython,brython-dev/brython,kikocorreoso/brython,kikocorreoso/brython