Traceback in default's Multi AR template report

[xispa]

Description of the issue/feature this PR addresses

This Pull Request fixes a Traceback that appears when trying to render the default MultiAR report

Current behavior before PR

Traceback (most recent call last):
  File "/home/xispa/senaite/zeocluster/src/senaite.core/bika/lims/browser/analysisrequest/publish.py", line 221, in getGroupedReportTemplate
    embedt, reptemplate = self._renderTemplate()
  File "/home/xispa/senaite/zeocluster/src/senaite.core/bika/lims/browser/analysisrequest/publish.py", line 195, in _renderTemplate
    return embedt, embed(self)
  File "/home/xispa/senaite/buildout-cache/eggs/Zope2-2.13.26-py2.7.egg/Products/Five/browser/pagetemplatefile.py", line 59, in __call__
    sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
  File "/home/xispa/senaite/buildout-cache/eggs/zope.pagetemplate-3.6.3-py2.7.egg/zope/pagetemplate/pagetemplate.py", line 132, in pt_render
    strictinsert=0, sourceAnnotations=sourceAnnotations
  File "/home/xispa/senaite/buildout-cache/eggs/five.pt-2.2.4-py2.7.egg/five/pt/engine.py", line 98, in __call__
    return self.template.render(**kwargs)
  File "/home/xispa/senaite/buildout-cache/eggs/z3c.pt-3.1.0-py2.7.egg/z3c/pt/pagetemplate.py", line 158, in render
    return base_renderer(**context)
  File "/home/xispa/senaite/buildout-cache/eggs/Chameleon-3.2-py2.7.egg/chameleon/zpt/template.py", line 297, in render
    return super(PageTemplate, self).render(**_kw)
  File "/home/xispa/senaite/buildout-cache/eggs/Chameleon-3.2-py2.7.egg/chameleon/template.py", line 191, in render
    raise_with_traceback(exc, tb)
  File "/home/xispa/senaite/buildout-cache/eggs/Chameleon-3.2-py2.7.egg/chameleon/template.py", line 171, in render
    self._render(stream, econtext, rcontext)
  File "20fe39995a9a90ce8c808364af65cbc8.py", line 627, in render
AttributeError: 'AnalysisRequestPublishView' object has no attribute '_client_address'

Desired behavior after PR is merged

--
I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.