fixes some HVR issues

Author: dooly123

Basis/Packages/dev.hai-vr.basis.comms/Scripts/Systems/Runtime/Components/Networking/HVRNetworkingCarrier.cs

@@ -47,6 +47,10 @@ public void OnHVRAvatarReady(bool isWearer)
 
         public void OnHVRReadyBothAvatarAndNetwork(bool isWearer)
         {
+            if (_comms == null)
+            {
+                throw new InvalidOperationException("HVRNetworkingCarrier was marked ready but its Comms component is null; HVR network data for this avatar cannot be processed.");
+            }
             _networkReady = true;
         }
     }

Basis/Packages/dev.hai-vr.basis.comms/Scripts/Systems/Runtime/Components/Networking/HVRVariableNetworking.cs

@@ -784,8 +784,10 @@ public void OnPacketReceived(byte localIdentifier, ArraySegment<byte> data)
                             if (index < _upgradedToHighFrequencyInOrder.Count)
                             {
                                 var highFrequency = _upgradedToHighFrequencyInOrder[index];
-                                var addressId = _networkIdToAddressId[highFrequency.networkId];
-                                highFrequencyInterpolatorDict[addressId] = DecodeFloat(packet.values[index], highFrequency);
+                                if (_networkIdToAddressId.TryGetValue(highFrequency.networkId, out var addressId))
+                                {
+                                    highFrequencyInterpolatorDict[addressId] = DecodeFloat(packet.values[index], highFrequency);
+                                }
                             }
                         }
                         _highFrequencyInterpolator.Add(new HVRInterpolationSnapshot