Lua generators use None instead of nil

[NathanSnail]

This causes

this generates list = {None, None, None} print(#list) printing 0

Expected Behavior:
The generator should produce list = {nil, nil, nil} print(#list) printing 3

To Fix

1. In the list block-code generators. Change references to 'None' to 'nil'.
2. Update the block-code generator tests if they are failing.

[NathanSnail]

Oops, the second example also outputs 0, however, nil should still be used though as None can be assigned to while nil can't be. nil is also a special type in Lua for no data

[BeksOmega]

The following code in the playground:

Generates the following Lua:

None = 123
list = {None, None, None}
print(list[1])

Which results in:

123

---

Ideally it should be:

None = 123
list = {nil, nil, nil}
print(list[1])

Resulting in:

nil

[neerajkumarc]

@BeksOmega Can I be assigned?

[BeksOmega]

@neerajkumarc Go for it =)