localrepository: use 'changectx.dirs()' in 'status()' for directory patterns when pattern which does not match against any files in working context is specified, current implementation of 'localrepository.status()' decides whether warning message about it should be shown or not by 'f not in context' this works correctly for 'file pattern', but not for 'directory pattern', because 'f not in context' always returns True for directories, even if they are related to the context. this patch uses 'changectx.dirs()' to examine whether specified pattern is related to the context as a directory or not.