misc: chore: Fix possible NullReferenceExceptions, InvalidOperationExceptions

src/ARMeilleure/Translation/Delegates.cs

@@ -58,7 +58,7 @@ namespace ARMeilleure.Translation
 
         private static string GetKey(MethodInfo info)
         {
-            return $"{info.DeclaringType.Name}.{info.Name}";
+            return $"{info.DeclaringType?.Name}.{info.Name}";
         }
 
         private static readonly SortedList<string, DelegateInfo> _delegates;

src/ARMeilleure/Translation/IntervalTree.cs

@@ -316,13 +316,16 @@ namespace ARMeilleure.Translation
             {
                 _root = newNode;
             }
-            else if (start.CompareTo(parent.Start) < 0)
+            else if (parent != null && start.CompareTo(parent.Start) < 0)
             {
                 parent.Left = newNode;
             }
             else
             {
-                parent.Right = newNode;
+                if (parent != null)
+                {
+                    parent.Right = newNode;
+                }
             }
 
             PropagateIncrease(newNode);