Template:Periods in Fooian television catnav/doc

For use on container categories for television by country and time period, to create "See also" links to that county's television categories for other time periods.

e.g. On Category:Television in Chile by year:

On Category:Television in Germany by decade

It is a wrapper around Category see also if exists, to save adding parameters

Usage
No parameters needed

Warnings
If none of the other categories currently exists, then a warning message is displayed when the page is being previewed:

This warning is displayed just below the "Preview" heading, and just above the page preview area. It is not displayed when the page has been saved

Error tracking
Usage on invalid pages is tracked in:
 * Category:Template Periods in Fooian television catnav on page with invalid title (population: )