fix: set az as optional when create network

set the az selector as an optional select when create a network

Closes-Bug: #2035012
Change-Id: Ica30d2b71ad3ef38430c0d862f4d0eab56b6b125

src/pages/network/containers/Network/actions/CreateNetwork.jsx

@@ -175,10 +175,13 @@ export class CreateNetwork extends ModalAction {
     const networkCommonData = {
       name,
       description,
-      availability_zone_hints: [availableZone],
       port_security_enabled,
     };
 
+    if (availableZone) {
+      networkCommonData.availability_zone_hints = [availableZone];
+    }
+
     if (mtu) {
       networkCommonData.mtu = mtu;
     }
@@ -374,7 +377,6 @@ export class CreateNetwork extends ModalAction {
         label: t('Available Zone'),
         type: 'select',
         placeholder: t('Please select'),
-        required: true,
         options: this.availableZones,
       },
       {