preprocess2 fails when topicref is missing regardless of processing-mode about dita-ot HOT 2 CLOSED

I ran into this, too with 4.2.2, but with a PDF build and no Errors found earlier in the log.. just a bunch of info messages about Keyrefs being defined more than once and this same Cannot invoke "Object.getClass()" because "s" is null stack trace later referencing KeyrefParser.java:214.

Digging around a little, I see PR #4407 on 14 Feb refactors the way some data sets are being passed around. Hoping not to send anyone on a wild-goose chase since I'm not familiar with how the code weaves together, but in the PR the only thing that looks suspect at first glance is chunk/ChunkModule.java:507 where toUnmodifiableList() is changed to toList(), which I think allows nulls unlike the former. Maybe somehow a null value is now allowed to make its way to normalProcessingRoleTargets that's passed to the unmodifiableSet() there on KeyrefParser.java:214? Because looking at these last few specific variables and functions mentioned in the stack trace, they haven't changed in years.

I tested on OT 4.2 (11 Feb) and the error doesn't occur.

Hope that helps!

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@arkadianriver thanks for the debugging info. Will look into this.

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