Make the Python manifest optional on Linux (#31761)

Author: pranavkm

src/Components/WebAssembly/BlazorManifest/acquire/Program.cs

@@ -113,7 +113,11 @@ static void Move(string source, string destination)
                         throw new NotSupportedException("Unsupported OS platform.");
                     }
                 }
-                packs.Add((packageName, item.Value.Version));
+
+                if (!string.IsNullOrEmpty(packageName))
+                {
+                    packs.Add((packageName, item.Value.Version));
+                }
             }
 
             return packs;

src/Components/WebAssembly/BlazorManifest/src/WorkloadManifest.json.in

@@ -48,7 +48,7 @@
       "alias-to": {
         "win-x86": "Microsoft.NET.Runtime.Emscripten.2.0.12.Python.win-x86",
         "win-x64": "Microsoft.NET.Runtime.Emscripten.2.0.12.Python.win-x64",
-        "linux-x64": "Microsoft.NET.Runtime.Emscripten.2.0.12.Python.linux-x64",
+        "linux-x64": null,
         "osx-x64": "Microsoft.NET.Runtime.Emscripten.2.0.12.Python.osx-x64"
       }
     },

src/Components/WebAssembly/BlazorManifest/src/WorkloadManifest.targets

@@ -7,7 +7,7 @@
       <Import Project="Sdk.props" Sdk="Microsoft.NET.Runtime.MonoAOTCompiler.Task" />
       <Import Project="Sdk.targets" Sdk="Microsoft.NET.Runtime.WebAssembly.Sdk" />
       <Import Project="Sdk.props" Sdk="Microsoft.Netcore.App.Runtime.Aot.Cross.browser-wasm" />
-      <Import Project="Sdk.props" Sdk="Microsoft.NET.Runtime.Emscripten.Python" />
+      <Import Project="Sdk.props" Sdk="Microsoft.NET.Runtime.Emscripten.Python" Condition="!$([MSBuild]::IsOsPlatform('Linux'))" />
       <Import Project="Sdk.props" Sdk="Microsoft.NET.Runtime.Emscripten.Node" />
       <Import Project="Sdk.props" Sdk="Microsoft.NET.Runtime.Emscripten.Sdk" />
     </ImportGroup>