OTR logs not properly ignored

Old conversation logs like

<html><head><meta http-equiv="content-type" content="text/html; charset=UTF-8"><title>Conversation with foo@sigxcpu.org at Mi 13 Dez 2017 13:26:25 CET on bar@sigxcpu.org/bar (jabber)</title></head><body><h3>Conversation with foo@sigxcpu.org at Mi 13 Dez 2017 13:26:25 CET on bar@sigxcpu.org/bar (jabber)</h3>
<font size="2">(13:26:35)</font><b> Attempting to start a private conversation with foo@sigxcpu.org...</b><br/>
</body></html>

resulting from the initiation of a OTR conversation are not handle but show empty chat bubble atm.

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