Add null check for default proximity sensor.

Without this we fail to boot on devices without a proximity sensor,
such as FVP.

Bug: 142352330
Change-Id: I474628d7ba32a9178fd720563fe2eca177920203
Merged-In: I474628d7ba32a9178fd720563fe2eca177920203

packages/SystemUI/src/com/android/systemui/util/sensors/SensorModule.java

@@ -44,7 +44,7 @@ public class SensorModule {
             Sensor defaultSensor = sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
             return thresholdSensorBuilder
                     .setSensor(defaultSensor)
-                    .setThresholdValue(defaultSensor.getMaximumRange())
+                    .setThresholdValue(defaultSensor != null ? defaultSensor.getMaximumRange() : 0)
                     .build();
         }
     }