Fix requests for deleted users

When users are requested from the authorship which no longer exist, they
shouldn't cause a 500.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/models/user.js

@@ -66,6 +66,9 @@ module.exports = function (sequelize, DataTypes) {
         })
       },
       getProfile: function (user) {
+        if (!user) {
+          return null
+        }
         return user.profile ? User.parseProfile(user.profile) : (user.email ? User.parseProfileByEmail(user.email) : null)
       },
       parseProfile: function (profile) {

lib/realtime.js

@@ -486,6 +486,7 @@ function startConnection (socket) {
       for (var i = 0; i < note.authors.length; i++) {
         var author = note.authors[i]
         var profile = models.User.getProfile(author.user)
+        if (profile) {
           authors[author.userId] = {
             userid: author.userId,
             color: author.color,
@@ -493,6 +494,7 @@ function startConnection (socket) {
             name: profile.name
           }
         }
+      }
 
       notes[noteId] = {
         id: noteId,