message: sv2017: fix optional args in function calls
diff: @@ -1270,7 +1270,7 @@ sequence_list_of_arguments:
  list_of_arguments:
  ( DOT identifier LPAREN ( expression )? RPAREN
  | expression
  - | COMMA
  + | COMMA ( expression )?
  )
  ( COMMA ( expression )? )*
  ( COMMA DOT identifier LPAREN ( expression )? RPAREN )*;
  