Changed getTenantconfiguration implementation.

components/device-mgt/org.wso2.carbon.device.mgt.mobile.impl/src/main/java/org/wso2/carbon/device/mgt/mobile/impl/android/AndroidDeviceManager.java

@@ -121,7 +121,7 @@ public class AndroidDeviceManager implements DeviceManager {
 						new StringReader(new String((byte[]) resource.getContent(), Charset.
 								forName(MobilePluginConstants.CHARSET_UTF8))));
 			}
-			return new TenantConfiguration();
+			return null;
 		} catch (MobileDeviceMgtPluginException e) {
 			throw new DeviceManagementException(
 					"Error occurred while retrieving the Registry instance : " + e.getMessage(), e);

components/device-mgt/org.wso2.carbon.device.mgt.mobile.impl/src/main/java/org/wso2/carbon/device/mgt/mobile/impl/windows/WindowsDeviceManager.java

@@ -106,11 +106,14 @@ public class WindowsDeviceManager implements DeviceManager {
                     MobileDeviceManagementUtil.getPlatformConfigPath(DeviceManagementConstants.
                             MobileDeviceTypes.MOBILE_DEVICE_TYPE_WINDOWS);
             resource = MobileDeviceManagementUtil.getRegistryResource(windowsTenantRegistryPath);
+            if(resource != null){
                 JAXBContext context = JAXBContext.newInstance(TenantConfiguration.class);
                 Unmarshaller unmarshaller = context.createUnmarshaller();
                 return (TenantConfiguration) unmarshaller.unmarshal(
-                    new StringReader(new String((byte[]) resource.getContent(), Charset
+                        new StringReader(new String((byte[]) resource.getContent(), Charset.
-                            .forName(MobilePluginConstants.CHARSET_UTF8))));
+                                                                         forName(MobilePluginConstants.CHARSET_UTF8))));
+            }
+            return null;
         } catch (MobileDeviceMgtPluginException e) {
             throw new DeviceManagementException(
                     "Error occurred while retrieving the Registry instance : " + e.getMessage(), e);