Resolve ""error" template"

Closes #2015 (closed)

service/src/main/java/lcsb/mapviewer/services/impl/UserService.java

@@ -121,7 +121,7 @@ public class UserService implements IUserService {
   @Override
   public User getUserByLogin(final String login, final boolean loadLazy) {
     User user = getUserByLogin(login);
-    if (loadLazy) {
+    if (loadLazy && user != null) {
       Hibernate.initialize(user.getPrivileges());
       if (user.getAnnotationSchema() != null) {
         for (final UserClassAnnotators annotator : user.getAnnotationSchema().getClassAnnotators()) {