Fix permission updating issue

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.webapp.publisher/src/main/java/io/entgra/device/mgt/core/apimgt/webapp/publisher/APIPublisherServiceImpl.java

@@ -732,18 +732,17 @@ public class APIPublisherServiceImpl implements APIPublisherService {
     }
 
     private void updatePermissions(String role, List<String> permissions) throws UserStoreException {
+        if (role == null || permissions == null) return;
         AuthorizationManager authorizationManager = APIPublisherDataHolder.getInstance().getUserRealm()
                 .getAuthorizationManager();
         if (log.isDebugEnabled()) {
             log.debug("Updating the role '" + role + "'");
         }
-        if (permissions != null && !permissions.isEmpty()) {
         authorizationManager.clearRoleAuthorization(role);
         for (String permission : permissions) {
             authorizationManager.authorizeRole(role, permission, CarbonConstants.UI_PERMISSION_ACTION);
         }
     }
-    }
 
     private void addRole(String role) throws UserStoreException {
         UserStoreManager userStoreManager = APIPublisherDataHolder.getInstance().getUserStoreManager();