[HOOK - conan-center.py] pre_export(): WARN: [RECIPE METADATA (KB-H003)] Conanfile doesn't have 'topics' attribute. 
[HOOK - conan-center.py] pre_export(): ERROR: [NO FINAL ENDLINE (KB-H041)] File '/tmp/c3ipr/co_pr_1604_2_0_0/recipes/libpng/all/test_package/test_package.cpp' does not end with an endline (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H041) 
[HOOK - conan-center.py] pre_export(): ERROR: [DELETE OPTIONS (KB-H045)] Found 'self.options.remove'. Replace it by 'del self.options.<opt>'. (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H045) 
ERROR: [HOOK - conan-center.py] pre_export(): Some checks failed running the hook, check the output