<p>Fixed in <a href="https://github.com/OfflineIMAP/offlineimap/commit/efc4df1bd73bb58fd170105f364fb0e80a0a2c97" class="commit-link"><tt>efc4df1</tt></a>, please test <code>next</code> branch.</p>

<p>This is a quick fix not fixing the real cause of this bug. Database should return an empty string, not None.</p>

<p>Hence, this issue is kept open.</p>

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