livedisplay: don't throw exception if config is not ready, warning is enough

Throwing an exception leads to rescueMode in oreo

Change-Id: I9c4cb7af8cae51936f439641b79ae522c84eaaee
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

sdk/src/java/lineageos/hardware/LiveDisplayManager.java

@@ -160,7 +160,7 @@ public class LiveDisplayManager {
         try {
             mConfig = sService.getConfig();
             if (mConfig == null) {
-                throw new RuntimeException("Unable to get LiveDisplay configuration!");
+                Log.w(TAG, "Unable to get LiveDisplay configuration!");
             }
         } catch (RemoteException e) {
             throw new RuntimeException("Unable to fetch LiveDisplay configuration!", e);