CKAN version
2.9

Describe the bug
I have boolean resource metadata keys defined via schemas in my DCOR instance. These are not written to the resources HTML page, because format_resource_items discards False boolean values.

Steps to reproduce
Set a value of a resource key to False.

Expected behavior
Value should be displayed on HTML resource page.

Additional details
This can be fixed by changing the line linked above

if not value or key in blacklist: 
    continue

to

if not isinstance(value, bool) and (not value or key in blacklist): 
    continue

I can write a PR including a test for format_resource_items if you give me green light.