old_contents: from django.utils.translation import ugettext_lazy as _
  from django_filters import CharFilter
  
  from geotrek.common.filters import StructureRelatedFilterSet, YearFilter, ValueFilter
  from geotrek.infrastructure.widgets import InfrastructureYearSelect, InfrastructureImplantationYearSelect
  from .models import Infrastructure
  
  
  class InfrastructureFilterSet(StructureRelatedFilterSet):
      name = CharFilter(label=_('Name'), lookup_expr='icontains')
      description = CharFilter(label=_('Description'), lookup_expr='icontains')
      implantation_year = ValueFilter(name='implantation_year',
                                      widget=InfrastructureImplantationYearSelect)
      intervention_year = YearFilter(name='interventions_set__date',
                                     widget=InfrastructureYearSelect)
  
      def __init__(self, *args, **kwargs):
          super(InfrastructureFilterSet, self).__init__(*args, **kwargs)
  
          field = self.form.fields['type__type']
          all_choices = field.widget.choices
          all_choices = [c for c in all_choices]
          field.widget.choices = [('', _(u"Category"))] + all_choices[1:]
  
      class Meta(StructureRelatedFilterSet.Meta):
          model = Infrastructure
          fields = StructureRelatedFilterSet.Meta.fields + ['type__type', 'type', 'condition', 'implantation_year',
                                                            'intervention_year', 'published']
  
new_contents: from django.utils.translation import ugettext_lazy as _
  from django_filters import CharFilter
  
  from geotrek.common.filters import StructureRelatedFilterSet, YearFilter, ValueFilter
  from geotrek.infrastructure.widgets import InfrastructureYearSelect, InfrastructureImplantationYearSelect
  from .models import Infrastructure
  
  
  class InfrastructureFilterSet(StructureRelatedFilterSet):
      name = CharFilter(label=_('Name'), lookup_expr='icontains')
      description = CharFilter(label=_('Description'), lookup_expr='icontains')
      implantation_year = ValueFilter(name='implantation_year',
                                      widget=InfrastructureImplantationYearSelect)
      intervention_year = YearFilter(name='interventions_set__date',
                                     widget=InfrastructureYearSelect)
  
      def __init__(self, *args, **kwargs):
          super(InfrastructureFilterSet, self).__init__(*args, **kwargs)
  
          field = self.form.fields['type__type']
          all_choices = field.widget.choices
          field.widget.choices = [('', _(u"Category"))] + all_choices[1:]
  
      class Meta(StructureRelatedFilterSet.Meta):
          model = Infrastructure
          fields = StructureRelatedFilterSet.Meta.fields + ['type__type', 'type', 'condition', 'implantation_year',
                                                            'intervention_year', 'published']
  
subject: Remove useless line all_choices