+ * \brief Empty file used to include "nothing" in macro expansion.
+ *
+ * If you want to conditionally include some file you can use this module
+ * as a dummy header:
+ *
+ * \code
+ * #if COND
+ * #define MYHEADER <realheader.h>
+ * #else
+ * #define MYHEADER <cfg/nothing.h>
+ * #endif
+ * \endcode