Fix possible PHP warning

Aleksander Machniak

2012-05-26 ad8552ea6ffc656fb65480290d00f0572bc1fcd0

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<roundcube:object name="logo" src="/images/roundcube_logo.png" id="logo" border="0" onclick="location.href='./?_page=1'" />
<roundcube:object name="message" id="message" />