Remove unused code in ScalarTest and equalsAndHashCode()

[salikjan]

Code snippet is never used:

final Scalar<String> nullScalar = new Scalar<String>(
            Arrays.asList(Mockito.mock(AbstractNode.class)),
            null
);

[amihaiemil]

@salikjan thanks for opening this!

I actually wanted to point out (I somehow forgot to mention it).
Any question you have about the code, anything you see that you don't understand or think could be improved - open an issue about it and we'll discuss it :)

[amihaiemil]

@salikjan Should I assign this to you? :P

[salikjan]

@amihaiemil yep )

[amihaiemil]

@salikjan thanks :)