Remove custom views of 404 and 500 errors

According to Django 1.11 documentation if there are 404.html and 500.html
pages in templates root directory then it loads them in case of 404 or
500 errors without any extra code needed. More details in:
https://docs.djangoproject.com/en/1.11/ref/views/#error-views

Signed-off-by: Alfredos-Panagiotis Damkalis <fredy@fredy.gr>

db/base/views.py

@@ -12,8 +12,7 @@ from django.contrib.sites.shortcuts import get_current_site
 from django.core.cache import cache
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import OperationalError
-from django.http import HttpResponse, HttpResponseNotFound, \
-    HttpResponseServerError, JsonResponse
+from django.http import HttpResponse, JsonResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.template.loader import render_to_string
 from django.urls import reverse
@@ -55,22 +54,6 @@ def home(request):
     )
 
 
-def custom_404(request):
-    """Custom 404 error handler.
-
-    :returns: 404.html
-    """
-    return HttpResponseNotFound(render(request, '404.html'))
-
-
-def custom_500(request):
-    """Custom 500 error handler.
-
-    :returns: 500.html
-    """
-    return HttpResponseServerError(render(request, '500.html'))
-
-
 def robots(request):
     """robots.txt handler
 

db/urls.py

@@ -11,10 +11,6 @@ from django.views.static import serve
 from db.api.urls import API_URLPATTERNS
 from db.base.urls import BASE_URLPATTERNS
 
-# pylint: disable=C0103
-handler404 = 'db.base.views.custom_404'
-handler500 = 'db.base.views.custom_500'
-
 urlpatterns = [
     # Base
     url(r'^', include(BASE_URLPATTERNS)),