apport generated urls can trigger UnicodeDecodeError

OOPS-6e5e984a017534cb393e47e50b93fe95

https://bugs.launchpad.net/launchpad/+filebug?field.title=package%20uml-utilities%2020070815-1.1ubuntu2%20failed%20to%20install/upgrade%3A%20el%20subproc%E9s%20post-installation%20script%20retorn%E0%20el%20codi%20d%27eixida%20d%27error%201

    /srv/launchpad.net/production/launchpad-rev-14381/lib/lp/bugs/browser/../templates/bugtarget-filebug-search.pt
    Line 98, Column 24
    Expression: <PathExpr standard:u'widget'>
       - Names:
          {'args': (),
           'context': <Product at 0x2acb28424310>,
           'default': <object object at 0x2acb0b29a250>,
           'loop': {},
           'nothing': None,
           'options': {},
           'repeat': {},
           'request': <lp.bugs.publisher.BugsBrowserRequest instance URL=https://bugs.launchpad.net/launchpad/+filebug>,
           'template': <z3c.ptcompat.ViewPageTemplateFile object at 0x9183950>,
           'view': <zope.browserpage.metaconfigure.FileBugGuidedView object at 0x1aa73050>,
           'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0x13bd1410>}
    Module zope.tales.expressions, line 217, in __call__
    return self._eval(econtext)
    Module zope.tales.expressions, line 211, in _eval
    return ob()
    Module zope.app.form.browser.textwidgets, line 136, in __call__
    return renderElement(self.tag, **kwargs)
    Module zope.app.form.browser.widget, line 537, in renderElement
    return renderTag(tag, **kw) + " />"
    Module zope.app.form.browser.widget, line 522, in renderTag
    attr_list.append(u'%s=%s' % (key, quoteattr(unicode(value))))

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe9 in position 79: ordinal not in range(128)<br />