#1390 NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE false positive

[Gili Tzabari]

Repro steps:

1. Create a subclass of java.util.concurrent.CountedCompleter.
2. Have the constructor invoke: "super(null)" which is legal according to the Javadoc
3. Findbugs will flag super(null) with NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE

[Gili Tzabari]

For step 2, the constructor should look like this:

public CandidateToFitnessComputer(@Nullable CandidateToFitnessComputer<c, f=""> parent)
{
super(parent);
}</c,>

Meaning, "parent" is tagged as @Nullable but Findbugs complains that it must be non-null.