M bug_report_page.php

• $f_product_version was not defined and hence the combo-box was not populated and an error was included in the html file (but was not visible in the browser).

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2527 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9