Fix pydantic error in defining NoneType read-only fields.

gso/workflows/l2_circuit/create_layer_2_circuit.py

@@ -55,16 +55,14 @@ def initial_input_generator(product_name: str) -> FormGenerator:
             vlan_range_label: Label = Field("Please set a VLAN range, bounds including.", exclude=True)
             vlan_range_lower_bound: VLAN_ID
             vlan_range_upper_bound: VLAN_ID
-        else:
-            vlan_range_lower_bound: ReadOnlyField(int) = None
-            vlan_range_upper_bound: ReadOnlyField(int) = None
+        vlan_range_lower_bound: ReadOnlyField(None, default_type=int)
+        vlan_range_upper_bound: ReadOnlyField(None, default_type=int)
 
         vlan_divider: Divider = Field(None, exclude=True)
 
         if initial_user_input.policer_enabled:
             policer_bandwidth: BandwidthString
-        else:
-            policer_bandwidth: ReadOnlyField(str) = None
+        policer_bandwidth: ReadOnlyField(None, default_type=str)
 
         policer_divider: Divider = Field(None, exclude=True)
 
@@ -87,15 +85,15 @@ def create_subscription(product: UUIDstr, partner: str) -> State:
 
 @step("Initialize subscription")
 def initialize_subscription(
-    subscription: Layer2CircuitInactive,
-    layer_2_circuit_side_a: dict[str, Any],
-    layer_2_circuit_side_b: dict[str, Any],
-    virtual_circuit_id: VC_ID | None,
-    layer_2_circuit_type: Layer2CircuitType,
-    vlan_range_lower_bound: VLAN_ID | None,
-    vlan_range_upper_bound: VLAN_ID | None,
-    policer_enabled: bool,  # noqa: FBT001
-    policer_bandwidth: BandwidthString | None,
+        subscription: Layer2CircuitInactive,
+        layer_2_circuit_side_a: dict[str, Any],
+        layer_2_circuit_side_b: dict[str, Any],
+        virtual_circuit_id: VC_ID | None,
+        layer_2_circuit_type: Layer2CircuitType,
+        vlan_range_lower_bound: VLAN_ID | None,
+        vlan_range_upper_bound: VLAN_ID | None,
+        policer_enabled: bool,  # noqa: FBT001
+        policer_bandwidth: BandwidthString | None,
 ) -> State:
     """Build a subscription object from all user input."""
     subscription.layer_2_circuit.layer_2_circuit_sides = [