Disable blazor.webview.js check when not building nodejs

Author: Mackinnon Buck

src/Components/WebView/WebView/src/Microsoft.AspNetCore.Components.WebView.csproj

@@ -64,17 +64,14 @@
   </PropertyGroup>
 
   <!-- blazor.webview.js should exist after eng/Npm.Workspace.nodeproj builds. Fall back if not. -->
-  <Target Name="_CheckBlazorWebViewJSPath" AfterTargets="ResolveProjectReferences" Condition=" !EXISTS('$(BlazorWebViewJSFile)') ">
-    <Warning Text="'$(BlazorWebViewJSFile)' does not exist. Falling back to checked-in copy." />
-    <PropertyGroup>
-      <BlazorWebViewJSFile>..\..\..\Web.JS\dist\Release\$(BlazorWebViewJSFilename)</BlazorWebViewJSFile>
-    </PropertyGroup>
+  <Target Name="_CheckBlazorWebViewJSPath" AfterTargets="ResolveProjectReferences" Condition=" '$(BuildNodeJS)' == 'true' AND !EXISTS('$(BlazorWebViewJSFile)') ">
+    <Error Text="'$(BlazorWebViewJSFile)' does not exist. Falling back to checked-in copy." />
   </Target>
 
   <Target Name="_AddEmbeddedBlazorWebView" BeforeTargets="_CalculateEmbeddedFilesManifestInputs" DependsOnTargets="_CheckBlazorWebViewJSPath">
     <ItemGroup>
       <EmbeddedResource Include="blazor.modules.json" LogicalName="_framework/blazor.modules.json" />
-      <EmbeddedResource Include="$(BlazorWebViewJSFile)" LogicalName="_framework/$(BlazorWebViewJSFilename)" />
+      <EmbeddedResource Include="$(BlazorWebViewJSFile)" LogicalName="_framework/$(BlazorWebViewJSFilename)" Condition="Exists('$(BlazorWebViewJSFile)')" />
       <EmbeddedResource Include="$(BlazorWebViewJSFile).map" LogicalName="_framework/$(BlazorWebViewJSFilename).map" Condition="Exists('$(BlazorWebViewJSFile).map')" />
     </ItemGroup>
   </Target>