fix(Features/CustomPostType): check invalid json files
fix(Features/CustomPostType): check invalid json files

* fix(Features/CustomPostTypes): show error message for invalid json files

and return empty array to allow code completion

* fix(Features/CustomPostTypes): remove invalid configs from array

don't try to register custom post types that have invalid json files

flyntwp/flynt-starter-theme,flyntwp/flynt-starter-theme,flyntwp/flynt-starter-theme