Preprocessor did not correctly handle when variadic macro arguments were not
provided at all, if there were other arguments: macro was not expanded
in case only the non variadic arguments were given.

 #define MACRO(...)       used to work fine for 0 or more arguments.
 #define MACRO(ARG0, ...) used to work only for 2 or more arguments, now fixed.

Change-Id: I64e9199ceccae05618a49931c2adad8e4f9471ba
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>