Fix: Do not call custom_field_set_value() in bug report and bug update if user has no write access.
Fix: Printing context in case of errors is not working properly (a lot of notices are generated).

M mantisbt/bug_report.php
M mantisbt/bug_update.php

• Do not call custom_field_set_value() if user has no write access.

M mantisbt/core/error_api.php

• Fix problems with dumping context.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2070 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9