UnicodeDecodeError in `DatatableMixin.render_column`

Hey there,

when working with Django 1.11 and Python 2.7 (yes, I know) one can end up with an UnicodeDecodeError:

Traceback:  

File "/usr/lib/python2.7/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/lib/python2.7/site-packages/django/views/generic/base.py" in view
  68.             return self.dispatch(request, *args, **kwargs)

File "/usr/lib/python2.7/site-packages/django/views/generic/base.py" in dispatch
  88.         return handler(request, *args, **kwargs)

File "/usr/lib/python2.7/site-packages/django_datatables_view/mixins.py" in get
  50.         func_val = self.get_context_data(**kwargs)

File "/usr/share/smash/issues/mixins/views.py" in get_context_data
  34.         context = super(IssueCategoryMixin, self).get_context_data(*args, **kwargs)

File "/usr/lib/python2.7/site-packages/django_datatables_view/base_datatable_view.py" in get_context_data
  364.                 data = self.prepare_results(qs)

File "/usr/lib/python2.7/site-packages/django_datatables_view/base_datatable_view.py" in prepare_results
  301.                 data.append([self.render_column(item, column) for column in self._columns])

File "/usr/share/smash/api/views.py" in render_column
  348.                 super(IssueDataTable, self).render_column(issue, column)

File "/usr/lib/python2.7/site-packages/django_datatables_view/base_datatable_view.py" in render_column
  165.             return format_html('<a href="{}">{}</a>', row.get_absolute_url(), value)

File "/usr/lib/python2.7/site-packages/django/utils/html.py" in format_html
  94.     return mark_safe(format_string.format(*args_safe, **kwargs_safe))

The simplest (but probably incomplete) solution would be to add the following at the beginning of base_datatable_view.py:

from __future__ import unicode_literals

‌

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