SystemUI: Log an error instead of throwing an exception if navigation bar is enabled in tablet UI

Signed-off-by: Mike Lockwood <lockwood@android.com>

packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java

@@ -456,8 +456,7 @@ public class TabletStatusBar extends StatusBar implements
             // Sanity-check that someone hasn't set up the config wrong and asked for a navigation
             // bar on a tablet that has only the system bar
             if (mWindowManager.hasNavigationBar()) {
-                throw new RuntimeException(
-                        "Tablet device cannot show navigation bar and system bar");
+                Slog.e(TAG, "Tablet device cannot show navigation bar and system bar");
             }
         } catch (RemoteException ex) {
         }