NullPointerException if null is returned as mailboxlist.
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Key: TIKA-641
URL: https://issues.apache.org/jira/browse/TIKA-641
Project: Tika
Issue Type: Wish
Components: parser
Affects Versions: 0.9
Environment: All
Reporter: Jens Wilmer
Priority: Trivial
Variable mailboxList should be checked to be non null before iterating over it
to avoid NullPointerException.
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