Don't exclude inline if has view permission

Currently, inlines with view permission are silently excluded by NestedModelAdmin where they would not be excluded by django.contrib.admin.ModelAdmin. This PR fixes that.

nested_inline/admin.py

@@ -34,6 +34,7 @@ def get_inline_instances(self, request, obj=None):
                 else:
                     if not (inline.has_add_permission(request, obj) or
                             inline.has_change_permission(request, obj) or
+                            inline.has_view_permission(request, obj) or
                             inline.has_delete_permission(request, obj)):
                         continue
                     if not inline.has_add_permission(request, obj):