- Fix new caching issue when broken/misleading object data was stored in…
71f72f928b2e
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Description

Fix new caching issue when broken/misleading object data was stored in database. The object must be cleaned up before storing in DB, because some code (out of rcube_message and rcube_imap classes) is changing objects data e.g. parts mimetype or body. Now it's become a problem because we're saving the object in cache at shutdown (after all modifications).
Make stored message object smaller by removing some redundant data.