generalized param array creation

helpers.py

@@ -82,5 +82,8 @@ def generate_param_array(args_tuple, parent_stmt=None):
     """ This generates an array, that can be used as a param """
     values = []
     for arg in args_tuple:
-        values.append([arg])
+        if arg is None:
+            values.append([])
+        else:
+            values.append([arg])
     return parsing.Array(parsing.Array.TUPLE, parent_stmt, values=values)