Lists nested in another lists

[tethal]

Code

sub f(any a) {
    printf("ARG: %N\n", a);
}

f(("a",));
f(((),));
f(((),()));

Result

ARG: list: (1 element)
  [0]="a"
ARG: <EMPTY LIST>
ARG: list: (2 elements)
  [0]=<EMPTY LIST>
  [1]=<EMPTY LIST>

Expected result:

ARG: list: (1 element)
  [0]="a"
ARG: list: (1 element)
  [0]=<EMPTY LIST>
ARG: list: (2 elements)
  [0]=<EMPTY LIST>
  [1]=<EMPTY LIST>

[tethal]

When this is fixed, please uncomment pushEmptyListToEmptyList and unshiftEmptyListToEmptyList in examples/test/qore/operators/list_ops.qtest

[tethal]

Another example (from #480):

$ qore -n -e 'const c = (("a",),); printf("%N\n", c);'
list: (1 element)
  [0]="a"