Fix Unity null propagation

Author: keveleigh

Assets/MixedRealityToolkit.Services/InputSimulation/SimulatedGestureHand.cs

@@ -59,7 +59,12 @@ private void EnsureProfileSettings()
             }
             initializedFromProfile = true;
 
-            var gestureProfile = CoreServices.InputSystem?.InputSystemProfile?.GesturesProfile;
+            MixedRealityGesturesProfile gestureProfile = null;
+            MixedRealityInputSystemProfile inputSystemProfile = CoreServices.InputSystem?.InputSystemProfile;
+            if (inputSystemProfile != null)
+            {
+                gestureProfile = inputSystemProfile.GesturesProfile;
+            }
             if (gestureProfile != null)
             {
                 for (int i = 0; i < gestureProfile.Gestures.Length; i++)

Assets/MixedRealityToolkit.Services/InputSystem/MixedRealityInputSystem.cs

@@ -248,10 +248,10 @@ private void CreateDataProviders()
             MixedRealityInputSystemProfile profile = ConfigurationProfile as MixedRealityInputSystemProfile;
 
             // If the system gets disabled, the gaze provider is destroyed.
-            // Ensure that it gets recreated on when reenabled.
-            if (GazeProvider == null)
+            // Ensure that it gets recreated on when re-enabled.
+            if (GazeProvider == null && profile != null)
             {
-                InstantiateGazeProvider(profile?.PointerProfile);
+                InstantiateGazeProvider(profile.PointerProfile);
             }
 
             if ((GetDataProviders().Count == 0) && (profile != null))
@@ -272,7 +272,7 @@ private void CreateDataProviders()
 
         private void InstantiateGazeProvider(MixedRealityPointerProfile pointerProfile)
         {
-            if (pointerProfile?.GazeProviderType?.Type != null)
+            if (pointerProfile != null && pointerProfile.GazeProviderType?.Type != null)
             {
                 GazeProvider = CameraCache.Main.gameObject.EnsureComponent(pointerProfile.GazeProviderType.Type) as IMixedRealityGazeProvider;
                 GazeProvider.GazeCursorPrefab = pointerProfile.GazeCursorPrefab;
@@ -991,7 +991,12 @@ public void RaiseFocusExit(IMixedRealityPointer pointer, GameObject unfocusedObj
         public void RaisePointerDown(IMixedRealityPointer pointer, MixedRealityInputAction inputAction, Handedness handedness = Handedness.None, IMixedRealityInputSource inputSource = null)
         {
             // Only lock the object if there is a grabbable above in the hierarchy
-            Transform currentObject = pointer.Result?.Details.Object?.transform;
+            Transform currentObject = null;
+            GameObject currentGameObject = pointer.Result?.Details.Object;
+            if (currentGameObject != null)
+            {
+                currentObject = currentGameObject.transform;
+            }
             IMixedRealityPointerHandler ancestorPointerHandler = null;
             while(currentObject != null && ancestorPointerHandler == null)
             {