Throw exception for "Multi-SortedSource" instead of returning null
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Key: LUCENE-3624
URL: https://issues.apache.org/jira/browse/LUCENE-3624
Project: Lucene - Java
Issue Type: Task
Reporter: Robert Muir
Spinoff of LUCENE-3623: currently if you addIndexes(FIR) or similar, you get a
NPE deep within codecs during merge.
I think the NPE is confusing, it looks like a bug but a clearer exception would
be an improvement.
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