chore: Syncs changes that were erroneously made in enterprise repo (#1949)

server/models/Document.js

@@ -95,6 +95,8 @@ const Document = sequelize.define(
     },
     getterMethods: {
       url: function () {
+        if (!this.title) return `/doc/untitled-${this.urlId}`;
+
         const slugifiedTitle = slugify(this.title);
         return `/doc/${slugifiedTitle}-${this.urlId}`;
       },

server/models/User.js

@@ -60,11 +60,12 @@ const User = sequelize.define(
           return original;
         }
 
+        const initial = this.name ? this.name[0] : "?";
         const hash = crypto
           .createHash("md5")
           .update(this.email || "")
           .digest("hex");
-        return `${DEFAULT_AVATAR_HOST}/avatar/${hash}/${this.name[0]}.png`;
+        return `${DEFAULT_AVATAR_HOST}/avatar/${hash}/${initial}.png`;
       },
     },
   }