Better update of the authorship of anonymous users

Co-authored-by: Yukai Huang <yukaihuangtw@gmail.com>
Signed-off-by: Giuseppe Lo Presti <giuseppe.lopresti@cern.ch>

lib/note/index.js

@@ -292,15 +292,15 @@ const updateNote = async (req, res) => {
         title: Note.parseNoteTitle(content),
         content: content,
         lastchangeAt: now,
-        authorship: req.isAuthenticated() ? [
+        authorship: [
           [
-            req.user.id,
+            req.isAuthenticated() ? req.user.id : null,
             0,
             content.length,
             now,
             now
           ]
-        ] : []
+        ]
       })
 
       if (!updated) {