ListIteratorNoNulls.java:36-37: Add also some null checks...

[0pdd]

The puzzle 1247-25d91c9c from #1247 has to be resolved:

cactoos/src/main/java/org/cactoos/list/ListIteratorNoNulls.java

Lines 36 to 37 in 07b063e

	* @todo #1247:30min Add also some null checks both to the `set` and
	* the `add` methods, then also add some tests to validate this behaviour.

The puzzle was created by Victor Noël on 13-Sep-20.

Estimate: 30 minutes, role: DEV.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is fixed and the text of the puzzle is removed from the source code. Here is more about PDD and about me.

[0pdd]

This puzzle inherited milestone 1.0 from issue #1247.

[0pdd]

The puzzle 1247-25d91c9c has disappeared from the source code, that's why I closed this issue.

[0crat]

@sereshqua/z please review this job completed by @fabriciofx/z, as in §30; the job will be fully closed and all payments will be made when the quality review is completed

[sereshqua]

@0crat quality good