Zipsplitter null body

[thomas-gantenbein-tga]

Description

See https://camel.zulipchat.com/#narrow/stream/257298-camel/topic/Idiomatic.20way.20to.20pollEnrich.20until.20there.20are.20no.20more.20items: In case one of the incoming bodies is null, this change should avoid failure of ZipAggregationStrategy.

I also addressed SonarQube warnings about cognitive complexity and removed deprecated annotations from test code while I was at it.

Viewing the three commits individually is probably best to see what changed in terms of functionality and what was just refactoring.

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[davsclaus]

I wonder if you would check camel-tarfile if the agg strategy there has similar issue

[thomas-gantenbein-tga]

You are right: It does have the same problem. Will address that in another PR.