Valida a tela de parlamentar caso a base esteja vazia

sapl/parlamentares/views.py

@@ -1,4 +1,5 @@
 from django.contrib import messages
+from django.core.exceptions import ObjectDoesNotExist
 from django.core.urlresolvers import reverse_lazy
 from django.shortcuts import redirect
 from django.utils.datastructures import MultiValueDictKeyError
@@ -114,17 +115,21 @@ class ParlamentarCrud(Crud):
             legislaturas = Legislatura.objects.all().order_by(
                 '-data_inicio', '-data_fim')
 
+            if legislaturas:
                 try:
                     legislatura_id = int(self.request.GET['periodo'])
                 except MultiValueDictKeyError:
                     legislatura_id = legislaturas.first().id
-
                 return legislatura_id
+            else:
+                return 0
 
         def get_queryset(self):
+            if self.take_legislatura_id() != 0:
                 mandatos = Mandato.objects.filter(
                     legislatura_id=self.take_legislatura_id())
                 return mandatos
+            return []
 
         def get_rows(self, object_list):
             parlamentares = []