xapian.DatabaseModifiedError exception is unhadled

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In a heavy update-during-search usage pattern when Xapian Database is being 
updated by process A (e.g. 'index' command), and another process B 
(Django+Djapian powered site) is being using the database for search, Xapian 
raises 'DatabaseModifiedError' exceptions periodically.

When 'DatabaseModifiedError' exception occurs, the Xapian Database instance 
must be reopened by using its 'reopen()' method.

Original issue reported on code.google.com by esizi...@gmail.com on 21 Oct 2011 at 12:45