fix console warnings for osds

.config/quickshell/modules/onScreenDisplay/OnScreenDisplayBrightness.qml

@@ -29,7 +29,7 @@ Scope {
     }
 
     Connections {
-        target: Brightness
+        target: Brightness ?? null
         function onValueChanged() {
             if (!Brightness.ready) return
             root.triggerOsd()
@@ -37,7 +37,7 @@ Scope {
     }
 
     Connections {
-        target: Audio.sink?.audio
+        target: Audio.sink?.audio ?? null
         function onVolumeChanged() {
             if (!Audio.ready) return
             root.showOsdValues = false

.config/quickshell/modules/onScreenDisplay/OnScreenDisplayVolume.qml

@@ -29,7 +29,7 @@ Scope {
     }
 
     Connections {
-        target: Audio.sink?.audio
+        target: Audio.sink?.audio ?? null
         function onVolumeChanged() {
             if (!Audio.ready) return
             root.triggerOsd()
@@ -37,7 +37,7 @@ Scope {
     }
 
     Connections {
-        target: Brightness
+        target: Brightness ?? null
         function onValueChanged() {
             if (!Brightness.ready) return
             root.showOsdValues = false
@@ -96,7 +96,7 @@ Scope {
                     OsdValueIndicator {
                         id: osdValues
                         anchors.centerIn: parent 
-                        value: Audio.sink?.audio.volume
+                        value: Audio.sink?.audio.volume ?? 0
                         icon: "volume_up"
                         name: qsTr("Volume")
                     }

.config/quickshell/services/Audio.qml

@@ -7,7 +7,7 @@ pragma ComponentBehavior: Bound
 Singleton {
     id: root
 
-    property bool ready: Pipewire.defaultAudioSink?.ready
+    property bool ready: Pipewire.defaultAudioSink?.ready ?? false
     property var sink: Pipewire.defaultAudioSink
     property var source: Pipewire.defaultAudioSource