fix(gaiia): correct mac_address to if_phys_address in inventory_creator

Also guard against empty model_id form submission.

lib/towerops/gaiia/inventory_creator.ex

@@ -206,8 +206,8 @@ defmodule Towerops.Gaiia.InventoryCreator do
       from(s in Towerops.Snmp.Interface,
         join: sd in SnmpDevice,
         on: s.snmp_device_id == sd.id,
-        where: sd.device_id == ^device.id and not is_nil(s.mac_address) and s.mac_address != "",
-        select: s.mac_address,
+        where: sd.device_id == ^device.id and not is_nil(s.if_phys_address) and s.if_phys_address != "",
+        select: s.if_phys_address,
         limit: 1
       )
     )

lib/towerops_web/live/org/gaiia_reconciliation_live.ex

@@ -103,6 +103,10 @@ defmodule ToweropsWeb.Org.GaiiaReconciliationLive do
     {:noreply, socket}
   end
 
+  def handle_event("create_gaiia_item", %{"device_id" => _, "model_id" => ""}, socket) do
+    {:noreply, put_flash(socket, :warning, t("Please select a model."))}
+  end
+
   def handle_event("create_gaiia_item", %{"device_id" => device_id, "model_id" => model_id}, socket) do
     org_id = socket.assigns.organization.id