print out warning instead of letting NPE happen for repeaters when they have
null elements.
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Key: WICKET-808
URL: https://issues.apache.org/jira/browse/WICKET-808
Project: Wicket
Issue Type: Improvement
Affects Versions: 1.3.0-beta2
Reporter: Eelco Hillenius
Assignee: Eelco Hillenius
Fix For: 1.3.0-beta3
Currently, when you provide null elements in the model (renderIterator), you'll
get a NPE exception further down the line (in ListView#renderItem for
instance). We should either throw an meaningful exception earlier, or we should
make repeaters more lenient and just print out a warning message. I opt for the
latter. This should be clear enough when developing (you probably would wonder
where your data is to start with) and a lot better than unexpectedly getting
NPEs in a production systems in case you missed it.
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