Merge pull request #317 from charithag/carbon-kernel-4.4.3

Fix for possible NPE that could happen due to null device or null pro…

components/mobile-plugins/mobile-base-plugin/org.wso2.carbon.device.mgt.mobile/src/main/java/org/wso2/carbon/device/mgt/mobile/util/MobileDeviceManagementUtil.java

@@ -73,11 +73,13 @@ public class MobileDeviceManagementUtil {
 	}
 
 	private static String getPropertyValue(Device device, String property) {
+		if (device != null && device.getProperties() != null) {
 			for (Device.Property prop : device.getProperties()) {
 				if (property.equals(prop.getName())) {
 					return prop.getValue();
 				}
 			}
+		}
 		return null;
 	}