Fix improper error checking

Victor Benincasa

2013-06-25 093a3d9e7df58e2bd41db2caf6a348bf60c9ec8a

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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" />