Fixing enrollment broken issue

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderService.java

@@ -220,6 +220,12 @@ public interface DeviceManagementProviderService {
 
     boolean setActive(DeviceIdentifier deviceId, boolean status) throws DeviceManagementException;
 
+    /**
+     * Returns the device of specified id.
+     * @param deviceId device Id
+     * @return Device returns null when device is not avaialble.
+     * @throws DeviceManagementException
+     */
     Device getDevice(DeviceIdentifier deviceId) throws DeviceManagementException;
 
     Device getDevice(DeviceIdentifier deviceId, Date since) throws DeviceManagementException;

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -828,7 +828,7 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
                 if (log.isDebugEnabled()) {
                     log.debug(msg);
                 }
-                throw new DeviceManagementException(msg);
+                return null;
             }
             DeviceInfo info = deviceInfoDAO.getDeviceInformation(device.getId());
             DeviceLocation location = deviceInfoDAO.getDeviceLocation(device.getId());