Fix for enrollment app install without Google

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android.core/src/main/java/org/wso2/carbon/device/mgt/mobile/android/core/util/AndroidDeviceUtils.java

@@ -705,7 +705,7 @@ public class AndroidDeviceUtils {
                 JsonElement googlePolicyPayload = appElement.getAsJsonObject().
                         get(AndroidConstants.ApplicationInstall.GOOGLE_POLICY_PAYLOAD);
 
-                if (googlePolicyPayload == null) {
+                if (googlePolicyPayload == null || googlePolicyPayload.toString().equals("\"\"")) {
                     uuid = appElement.getAsJsonObject().
                             get(AndroidConstants.ApplicationInstall.ENROLLMENT_APP_INSTALL_UUID).getAsString();
                     try (CloseableHttpClient httpClient = HttpClients.createDefault()) {