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Help: Package without components should use 'check_required_components' too

Ruslan Baratov requested to merge ruslo/cmake:pr.doc.components into master

Macro check_required_components should be called even if there are no components provided by package. This will make sure error is reported in next cases:

find_package(Foo CONFIG REQUIRED oops) # 'oops' treated as component
find_package(Foo CONFIG REQUIRED COMPONENTS foo) # no components expected

Topic-rename: CMakePackageConfigHelpers-doc

Edited by Brad King

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