Append-renumber for objects without numbers yet

[tjlaboss]

Is your feature request related to a problem? Please describe.

I'm always frustrated when...

appending an object created from scratch (that does not have a number assigned yet) to a NumberedObjectCollection.

If no number is assigned, it results in the following error:

Traceback (most recent call last):
  File "./prototype.py", line 156, in <module>
    main()
    ~~~~^^
  File "./prototype.py", line 151, in main
    something(deck, pos=f1)
    ~~~~~~~~~^^^^^^^^^^^^^^
  File "./prototype.py", line 131, in something
    deck.cells.append_renumber(cell)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "./montepy/numbered_object_collection.py", line 613, in append_renumber
    number = obj.number if obj.number > 0 else 1
                           ^^^^^^^^^^^^^^
TypeError: '>' not supported between instances of 'NoneType' and 'int'

Describe the solution you'd like

When obj.number is None, then NumberedObjectCollection.append_renumber() should just assign the next available number.

Describe alternatives you've considered

None

[MicahGale]

I think this could be considered a bug.

[MicahGale]

I think we should also modify the behavior of append. When appending an object with number is None I think it should automatically append_renumber instead of erroring out.

[tjlaboss]

Yes. Currently this behavior occurs within append_renumber()