fix: Check if RootContainer is null before referencing its members. (#5173)

Content.Shared/Body/Systems/SharedBodySystem.Body.cs

@@ -258,9 +258,8 @@ public partial class SharedBodySystem
     {
         if (id is null
             || !Resolve(id.Value, ref body, logMissing: false)
+            || body.RootContainer is null // Delta-V - Fix this shitmed change
             || body.RootContainer.ContainedEntity is null
-            || body is null // Shitmed Change
-            || body.RootContainer == default // Shitmed Change
             || !Resolve(body.RootContainer.ContainedEntity.Value, ref rootPart))
         {
             yield break;