Set converted Django connections to required

Author: Alexandre Kirszenberg

graphene_django/converter.py

@@ -185,11 +185,11 @@ def dynamic_type():
             if _type._meta.filter_fields:
                 from .filter.fields import DjangoFilterConnectionField
 
-                return DjangoFilterConnectionField(_type)
+                return DjangoFilterConnectionField(_type, required=True)
 
-            return DjangoConnectionField(_type)
+            return DjangoConnectionField(_type, required=True)
 
-        return DjangoListField(_type)
+        return DjangoListField(_type, required=True)
 
     return Dynamic(dynamic_type)