PuseAudioManager: fix crash with non-app audio source (#280)

Settings crashes when you have a Bluetooth audio player paired like for example a phone

data/sound.metainfo.xml.in

@@ -35,6 +35,16 @@
   <update_contact>contact_at_elementary.io</update_contact>
 
   <releases>
+    <release version="8.0.1" date="2024-08-21" urgency="medium">
+      <description>
+        <p>Improvements:</p>
+        <ul>
+          <li>Fix crash when connecting bluetooth audio players</li>
+          <li>Updated translations</li>
+        </ul>
+      </description>
+    </release>
+
     <release version="8.0.0" date="2024-07-26" urgency="medium">
       <description>
         <p>New Features:</p>

src/PulseAudioManager.vala

@@ -610,6 +610,14 @@ public class Sound.PulseAudioManager : GLib.Object {
             return;
         }
 
+        // Can't construct an app object
+        if (
+            sink_input.proplist.contains (PulseAudio.Proplist.PROP_APPLICATION_ID) == 0 ||
+            sink_input.proplist.contains (PulseAudio.Proplist.PROP_APPLICATION_NAME) == 0
+        ) {
+            return;
+        }
+
         App? app = null;
         for (uint i = 0; i < apps.get_n_items (); i++) {
             var _app = (App) apps.get_item (i);