NPE trying to convert Epoch date 1970-01-01 to Timestamp

[njimenezotto]

The following case throws a NPE

Date defaultEpochDate = new Date(0);
mapToTimestamp(defaultEpochDate.toInstant())

The problem is for this case EpochSecond and Nano are 0 and this builder does not allow it.

mapstruct-spi-protobuf/support-core/src/main/java/no/entur/abt/mapstruct/common/ProtobufStandardMappings.java

Line 164 in 7ffeba8

Timestamp t = Timestamp.newBuilder().setSeconds(i.getEpochSecond()).setNanos(i.getNano()).build();

I think the solution could be to handle the 0 seconds case and use the Timestamp.getDefaultInstance() instead.