[Tests] Fixed some unit tests

sources/assets/Xenko.Core.Assets.Tests/TestAssetCollision.cs

@@ -106,6 +106,7 @@ public void TestWithPackage()
 
             var package = new Package();
             package.Assets.Add(new AssetItem("0", asset));
+            var session = new PackageSession(package);
 
             for (int i = 0; i < 10; i++)
             {

sources/assets/Xenko.Core.Assets.Tests/TestTemplateManager.cs

@@ -28,11 +28,6 @@ public void TestTemplateGenerator()
         {
             TemplateManager.Register(this);
 
-            // Preload templates defined in Xenko.xkpkg
-            var descriptions = TemplateManager.FindTemplates().ToList();
-
-            Assert.True(descriptions.Count > 0);
-
             var templateGenerator = TemplateManager.FindTemplateGenerator(new SessionTemplateGeneratorParameters());
 
             Assert.Equal(this, templateGenerator);