ArgumentCaptor: NPE when an null array is passed to a varargs method

[ChristianSchwarz]

A NullPointerException is thrown if an null array is passed to a varargs method.

@Test
public void shouldCaptureVarArgs_nullArrayArg() {
        String[] argArray = null;
        mock.varargs(argArray);

        verify(mock).varargs(captor.capture()); //<- Kaboom NPE
}

Since an vararg is simply an array the ArgumentCaptor should reject it silently. This relates to #565.

java.lang.NullPointerException
    at java.lang.reflect.Array.getLength(Native Method)
    at org.mockito.internal.invocation.InvocationMatcher.captureVarargsPart(InvocationMatcher.java:142)
    at org.mockito.internal.invocation.InvocationMatcher.captureArgumentsFrom(InvocationMatcher.java:122)
    at org.mockito.internal.invocation.InvocationMarker.markVerified(InvocationMarker.java:24)
    at org.mockito.internal.invocation.InvocationMarker.markVerified(InvocationMarker.java:18)
    at org.mockito.internal.verification.checkers.NumberOfInvocationsChecker.check(NumberOfInvocationsChecker.java:43)
    at org.mockito.internal.verification.Times.verify(Times.java:40)
    at org.mockito.internal.verification.MockAwareVerificationMode.verify(MockAwareVerificationMode.java:21)
    at org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:73)
    at org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:32)
    at org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:37)
    at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:36)
    at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.access$0(MockMethodInterceptor.java:32)
    at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptAbstract(MockMethodInterceptor.java:113)
    at org.mockitousage.IMethods$MockitoMock$81506210.varargs(Unknown Source)
    at org.mockitousage.matchers.VarargsTest.shouldCaptureVarArgs_nullArrayArg(VarargsTest.java:182)

[TimvdLippe]

Probably related to #567