Fixed smalled things due to nullable refernece types

src/Umbraco.Web.Common/Profiler/WebProfiler.cs

@@ -29,7 +29,7 @@ public class WebProfiler : IProfiler
     public void Start()
     {
         MiniProfiler.StartNew();
-        MiniProfilerContext.Value = MiniProfiler.Current;
+        MiniProfilerContext.Value = MiniProfiler.Current!;
     }
 
     public void Stop(bool discardResults = false) => MiniProfilerContext.Value?.Stop(discardResults);
@@ -84,7 +84,7 @@ public class WebProfiler : IProfiler
 
                 if (cookieValue is not null)
                 {
-                    AddSubProfiler(MiniProfiler.FromJson(cookieValue));
+                    AddSubProfiler(MiniProfiler.FromJson(cookieValue)!);
                 }
 
                 // If it is a redirect to a relative path (local redirect)

src/Umbraco.Web.Common/Profiler/WebProfilerHtml.cs

@@ -34,7 +34,7 @@ public class WebProfilerHtml : IProfilerHtml
 
         var result = StackExchange.Profiling.Internal.Render.Includes(
             profiler,
-            context is not null ? context.Request.PathBase + path : null,
+            context is not null ? context.Request.PathBase + path : string.Empty,
             true,
             new List<Guid> { profiler.Id },
             RenderPosition.Right,

tests/Umbraco.Tests.Common/Umbraco.Tests.Common.csproj

@@ -9,7 +9,6 @@
 
   <ItemGroup>
     <PackageReference Include="AutoFixture.AutoMoq" Version="4.18.0" />
-    <PackageReference Include="MiniProfiler.AspNetCore" Version="4.2.22" />
     <PackageReference Include="Moq" Version="4.18.4" />
     <PackageReference Include="AutoFixture.NUnit3" Version="4.18.0" />
     <PackageReference Include="NUnit" Version="3.14.0" />