Fix cleanups again

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/activities/CallActivity.java

@@ -1009,9 +1009,7 @@ public class CallActivity extends AppCompatActivity {
                 peerConnectionFactory = null;
             }
 
-
             hangupNetworkCalls();
-
         }
     }
 

app/src/main/java/com/nextcloud/talk/webrtc/MagicPeerConnectionWrapper.java

@@ -99,7 +99,7 @@ public class MagicPeerConnectionWrapper {
         }
 
         if (peerConnection != null) {
-            peerConnection.dispose();
+            peerConnection.close();
             peerConnection = null;
         }
     }
@@ -185,7 +185,7 @@ public class MagicPeerConnectionWrapper {
 
         @Override
         public void onStateChange() {
-            if (magicDataChannel.state().equals(DataChannel.State.OPEN) &&
+            if (magicDataChannel != null && magicDataChannel.state().equals(DataChannel.State.OPEN) &&
                     magicDataChannel.label().equals("status")) {
                 sendInitialMediaStatus();
             }