Merge branches 'proto/binfmt-condt-changewave' and 'translate-null-for-new-field' into vs17.8

And bump version to 17.8.1

eng/Versions.props

@@ -2,7 +2,7 @@
 <!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the MIT license. See License.txt in the project root for full license information. -->
 <Project>
   <PropertyGroup>
-    <VersionPrefix>17.8.0</VersionPrefix><DotNetFinalVersionKind>release</DotNetFinalVersionKind>
+    <VersionPrefix>17.8.1</VersionPrefix><DotNetFinalVersionKind>release</DotNetFinalVersionKind>
     <PackageValidationBaselineVersion>17.7.0</PackageValidationBaselineVersion>
     <AssemblyVersion>15.1.0.0</AssemblyVersion>
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>

src/Build/Instance/TaskFactories/TaskHostTask.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
@@ -436,7 +436,7 @@ namespace Microsoft.Build.BackEnd
         private void HandleTaskHostTaskComplete(TaskHostTaskComplete taskHostTaskComplete)
         {
 #if FEATURE_REPORTFILEACCESSES
-            if (taskHostTaskComplete.FileAccessData.Count > 0)
+            if (taskHostTaskComplete.FileAccessData?.Count > 0)
             {
                 IFileAccessManager fileAccessManager = ((IFileAccessManager)_buildComponentHost.GetComponent(BuildComponentType.FileAccessManager));
                 foreach (FileAccessData fileAccessData in taskHostTaskComplete.FileAccessData)

src/Shared/TaskHostTaskComplete.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
@@ -245,6 +245,9 @@ namespace Microsoft.Build.BackEnd
             translator.TranslateDictionary(ref _buildProcessEnvironment, StringComparer.OrdinalIgnoreCase);
 #if FEATURE_REPORTFILEACCESSES
             translator.Translate(ref _fileAccessData);
+#else
+            bool hasFileAccessData = false;
+            translator.Translate(ref hasFileAccessData);
 #endif
         }