Use PegAddress.Empty in RayCastPeg

CriticalPathAnalyzer/CriticalPathAnalyzer/src/client/tool/CriticalPathAnalyzerTool.cs

@@ -29,11 +29,11 @@ namespace CriticalPathAnalyzer.Client.Tool {
             PathHighLighter.RemoveHighLighting();
         }
 
-        private static PegAddress? RayCastPeg() {
+        private static PegAddress RayCastPeg() {
             // Ray-cast into the world to find what the player is looking at
             HitInfo hitInfo = PlayerCaster.CameraCast(Masks.Environment | Masks.Structure | Masks.Peg | Masks.Wire);
             if (!hitInfo.HitSomething) {
-                return null;
+                return PegAddress.Empty;
             }
 
             // Resolve hit target:
@@ -50,15 +50,15 @@ namespace CriticalPathAnalyzer.Client.Tool {
                 return wire.Point1.IsInputAddress() ? wire.Point1 : wire.Point2;
             }
 
-            return null;
+            return PegAddress.Empty;
         }
 
         public static void SelectPathStart() {
             _logger.Info("Analyze Path Start");
-            PegAddress? pegAddress = RayCastPeg();
-            if (pegAddress != null) {
-                _startPegAddress = pegAddress.Value;
-                if (_startPegAddress != null && _endPegAddress != null) {
+            PegAddress pegAddress = RayCastPeg();
+            if (!pegAddress.IsEmpty()) {
+                _startPegAddress = pegAddress;
+                if (!_startPegAddress.IsEmpty() && !_endPegAddress.IsEmpty()) {
                     CalculateCriticalPath();
                 }
             }
@@ -66,10 +66,10 @@ namespace CriticalPathAnalyzer.Client.Tool {
 
         public static void SelectPathEnd() {
             _logger.Info("Analyze Path End");
-            PegAddress? pegAddress = RayCastPeg();
-            if (pegAddress != null) {
-                _endPegAddress = pegAddress.Value;
-                if (_startPegAddress != null && _endPegAddress != null) {
+            PegAddress pegAddress = RayCastPeg();
+            if (!pegAddress.IsEmpty()) {
+                _endPegAddress = pegAddress;
+                if (!_startPegAddress.IsEmpty() && !_endPegAddress.IsEmpty()) {
                     CalculateCriticalPath();
                 }
             }