return empty permissions set in case of document/folder unexistence

Author: car031

logicaldoc-core/src/main/java/com/logicaldoc/core/document/HibernateDocumentDAO.java

@@ -1419,10 +1419,13 @@ private User getExistingtUser(long userId) throws PersistenceException {
 	public Set<Permission> getAllowedPermissions(long docId, long userId) throws PersistenceException {
 		final Set<Permission> permissions = new HashSet<>();
 		User user = getExistingtUser(userId);
+		if(user==null)
+			return new HashSet<>();
+		
 		userDAO.initialize(user);
 
 		if (findById(docId) == null)
-			throw new PersistenceException("Unexisting document " + docId);
+			return new HashSet<>();
 
 		// If the user is an administrator bypass all controls
 		if (user.isAdmin()) {

logicaldoc-core/src/main/java/com/logicaldoc/core/folder/HibernateFolderDAO.java

@@ -917,6 +917,8 @@ public void restore(long folderId, long parentId, FolderHistory transaction) thr
 	public Set<Permission> getAllowedPermissions(long folderId, long userId) throws PersistenceException {
 		final Set<Permission> permissions = new HashSet<>();
 		User user = getExistingtUser(userId);
+		if (user == null)
+			return new HashSet<>();
 
 		// If the user is an administrator bypass all controls
 		if (user.isMemberOf(Group.GROUP_ADMIN))
@@ -930,6 +932,8 @@ public Set<Permission> getAllowedPermissions(long folderId, long userId) throws
 		// the policies
 		long id = folderId;
 		Folder folder = findById(folderId);
+		if (folder == null)
+			return new HashSet<>();
 
 		if (folder.getSecurityRef() != null) {
 			id = folder.getSecurityRef().longValue();