Bugfix custom report list

[Szymiks]

Resolves: #445
I had an error after clean database, when I wanted to get to my reports I had an Attribute error, I wasn't sure why but on debugging I found that queryset returned some reports. I found that add this filter resolve the problem.

[rwrzesien]

I had an error after clean database, when I wanted to get to my reports I had an Attribute error, I wasn't sure why but on debugging I found that queryset returned some reports.

Chose one :) you should not have any reports on clean database. Could you please paste the error stack trace here?

[Szymiks]

I had an error after clean database, when I wanted to get to my reports I had an Attribute error, I wasn't sure why but on debugging I found that queryset returned some reports.

Chose one :) you should not have any reports on clean database. Could you please paste the error stack trace here?

Traceback (most recent call last):
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/core/handlers/base.py", line 145, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/core/handlers/base.py", line 143, in _get_response
    response = response.render()
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/response.py", line 106, in render
    self.content = self.rendered_content
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/response.py", line 83, in rendered_content
    content = template.render(context, self._request)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 171, in render
    return self._render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/defaulttags.py", line 309, in render
    return nodelist.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 987, in render
    output = self.filter_expression.resolve(context)
  File "/home/szymi/virtualenv/sheetstorm-SgY9UmI-/lib/python3.7/site-packages/django/template/base.py", line 698, in resolve
    new_obj = func(obj, *arg_vals)
  File "/home/szymi/Dokumenty/GitRepos/sheetstorm/sheetstorm/employees/templatetags/data_display_filters.py", line 13, in duration_field_to_string
    return timedelta_to_string(data)
  File "/home/szymi/Dokumenty/GitRepos/sheetstorm/sheetstorm/common/convert.py", line 13, in timedelta_to_string
    days = data.days
AttributeError: 'str' object has no attribute 'days'

I didn't add that, I have added fixtures and register new user and then for him I had this error.

[dybi]