scripts: Fix compatibility issues with new Lua Properties API

We need to explicitly use Properties() in those cases as {} construct tables.

src/scripts/device/autoswitch-bluetooth-profile.lua

@@ -49,7 +49,7 @@ function handlePersistentSetting (enable)
     -- the state storage
     state = Settings.get_boolean ("bluetooth.autoswitch-to-headset-profile")
         and State ("bluetooth-autoswitch") or nil
-    headset_profiles = state and state:load () or {}
+    headset_profiles = state and state:load () or Properties()
   else
     state = nil
     headset_profiles = nil

src/scripts/device/find-best-routes.lua

@@ -27,7 +27,7 @@ SimpleEventHook {
     local device = event:get_subject ()
     local event_properties = event:get_properties ()
     local active_ids = event_properties ["profile.active-device-ids"]
-    local selected_routes = event:get_data ("selected-routes") or {}
+    local selected_routes = event:get_data ("selected-routes") or Properties()
 
     local dev_info = devinfo:get_device_info (device)
     assert (dev_info)

src/scripts/device/state-routes.lua

@@ -36,7 +36,7 @@ find_stored_routes_hook = SimpleEventHook {
     local event_properties = event:get_properties ()
     local profile_name = event_properties ["profile.name"]
     local active_ids = event_properties ["profile.active-device-ids"]
-    local selected_routes = event:get_data ("selected-routes") or {}
+    local selected_routes = event:get_data ("selected-routes") or Properties()
 
     local dev_info = devinfo:get_device_info (device)
     assert (dev_info)
@@ -108,7 +108,7 @@ apply_route_props_hook = SimpleEventHook {
   },
   execute = function (event)
     local device = event:get_subject ()
-    local selected_routes = event:get_data ("selected-routes") or {}
+    local selected_routes = event:get_data ("selected-routes") or Properties()
     local new_selected_routes = {}
 
     local dev_info = devinfo:get_device_info (device)

src/scripts/monitors/bluez-midi.lua

@@ -78,7 +78,7 @@ end
 
 function createMonitor()
   local monitor_props = {}
-  for k, v in pairs(config.properties or {}) do
+  for k, v in pairs(config.properties or Properties()) do
     monitor_props[k] = v
   end