CMake Templates complain about unset PROJECT_URL

"cmake.d/02-variables.cmake" checks "HOMEPAGE_URL" but when not found, the warning complains about PROJECT_URL not being set.

I guess HOMEPAGE_URL is wrong in the following section, (most of the projects use PROJECT_URL):

{{if(NOT HOMEPAGE_URL)}}
{{ {{ message(WARNING "${Red}No homepage url found. Please set a PROJECT_URL cmake variable in your config.cmake.")}}}}
{{ endif()}}