Fix NoSuchElementException for anonymous users in spaces listing and miniList templates (#460)

- Add user existence checks before accessing user properties in app/views/spaces/listSpaces.scala.html and app/views/spaces/miniList.scala.html
- Update CHANGELOG.md with details of the fix in Unreleased section

Co-authored-by: Luigi Marini <[email protected]>

Author: robkooper

CHANGELOG.md

@@ -5,9 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased]
+## Unreleased
 
 ### Fixed
+- Fixed `NoSuchElementException` in spaces listing page when user is not defined. The error occurred when calling `user.get.id` on an undefined user in the spaces ownership dropdown. Added proper user existence checks in `listSpaces.scala.html` and `miniList.scala.html` templates.
 - Removed refrences to repo.typesafe.com from sbt-launch.jar and build.scala
 
 ### Removed

app/views/spaces/listSpaces.scala.html

@@ -47,13 +47,15 @@ <h1>@title</h1>
                         case (_, _) => {}
                     }
                 }
-                <div class="btn-group btn-group-sm" id="spacesOwnership-displayed-dropdown">
-                    <select id="spacesOwnership" class="form-control" onchange="getSpaceType('@user.get.id')">
-                        <option value="1">Joined Spaces</option>
-                        <option value="2">My Spaces</option>
-                        <option value="3">All Spaces</option>
-                    </select>
-                </div>
+                @if(user.isDefined) {
+                    <div class="btn-group btn-group-sm" id="spacesOwnership-displayed-dropdown">
+                        <select id="spacesOwnership" class="form-control" onchange="getSpaceType('@user.get.id')">
+                            <option value="1">Joined Spaces</option>
+                            <option value="2">My Spaces</option>
+                            <option value="3">All Spaces</option>
+                        </select>
+                    </div>
+                }
                 <div class="btn-group btn-group-sm" id="number-displayed-dropdown">
                     <select id="numPageItems" class="form-control" onchange="getValue()">
                         <option value="12">12</option>

app/views/spaces/miniList.scala.html

@@ -23,7 +23,7 @@
     <div class="text-center">
         @if(ownProfile) {
             <div>@Messages("home.empty.message", Messages("spaces.title").toLowerCase)</div>
-            @if(user.get.status != UserStatus.ReadOnly) {
+            @if(user.isDefined && user.get.status != UserStatus.ReadOnly) {
                 <div><a class="btn-link" href="@routes.Spaces.newSpace()" title="Create a new @Messages("space.title")">@Messages("create.title", Messages("space.title"))</a></div>
             }
         } else {