Link.equals throws NPE on null object

[narbonij]

The following code throws a NullPointerException:

Link link = new Link(New Node(), new Node());
link.equals(null);

Is that normal ?

[remikey]

No, it is not. Thank you for the report! :-)

Merged into develop:

• Link.equals(null) returns false instead of throwing NPE;
• Related UT added in order to check that the issue is not present on main objects (Node, Link, Color).