Fix attributes on properties

Author: MerlinVR

Assets/UdonSharp/Editor/UdonSharpPropertyVisitor.cs

@@ -41,9 +41,9 @@ public override void VisitPropertyDeclaration(PropertyDeclarationSyntax node)
             {
                 foreach (AttributeListSyntax attributes in node.AttributeLists)
                 {
-                    foreach (AttributeSyntax attribute in attributes.Attributes)
+                    if (attributes.Target != null && attributes.Target.Identifier.Kind() == SyntaxKind.FieldKeyword)
                     {
-                        if (attributes.Target.Identifier.Kind() == SyntaxKind.FieldKeyword)
+                        foreach (AttributeSyntax attribute in attributes.Attributes)
                         {
                             using (ExpressionCaptureScope attributeTypeCapture = new ExpressionCaptureScope(visitorContext, null))
                             {

Assets/UdonSharp/Tests/TestScripts/Core/PropertyTest.cs

@@ -1,4 +1,5 @@
 
+using JetBrains.Annotations;
 using UdonSharp;
 using UnityEngine;
 using VRC.SDKBase;
@@ -14,6 +15,7 @@ public class PropertyTest : UdonSharpBehaviour
 
         public string MyStrProperty => "Test " + 1;
 
+        [PublicAPI]
         public int MyIntProperty { get; set; }
 
         float backingFloat;