Fix build break

We didn't have a test for the case where RazorCompileOnPublish is false
and Publish is being called. This is breaking the precompilation repo.

src/Microsoft.AspNetCore.Razor.Design/build/netstandard2.0/Microsoft.AspNetCore.Razor.Design.targets

@@ -162,14 +162,15 @@
   </Target>
 
   <!--
-    This target is called after PrepareForPublish when RazorCompileOnBuild=true so that we can hook into publish.
+    This target is called after PrepareForPublish when RazorCompileOnPublish=true so that we can hook into publish.
     This target just hooks up other targets since Publish and PrepareForPublish don't have a DependsOnTargets
     property we can use. 
   -->
   <Target 
     Name="_RazorPrepareForPublish"
     AfterTargets="PrepareForPublish"
-    DependsOnTargets="RazorCompile">
+    DependsOnTargets="RazorCompile"
+    Condition="'$(RazorCompileOnPublish)'=='true'">
   </Target>
 
   <!--

test/Microsoft.AspNetCore.Razor.Design.Test/IntegrationTests/PublishIntegrationTest.cs

@@ -91,6 +91,23 @@ namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests
             Assert.FileDoesNotExist(result, PublishOutputPath, "SimpleMvc.PrecompiledViews.pdb");
         }
 
+        [Fact]
+        [InitializeTestProject("SimpleMvc")]
+        public async Task Publish_NoopsWith_RazorCompileOnPublishFalse()
+        {
+            Directory.Delete(Path.Combine(Project.DirectoryPath, "Views"), recursive: true);
+
+            var result = await DotnetMSBuild("Publish", "/p:RazorCompileOnPublish=false");
+
+            Assert.BuildPassed(result);
+
+            // Everything we do should noop - including building the app. 
+            Assert.FileExists(result, PublishOutputPath, "SimpleMvc.dll");
+            Assert.FileExists(result, PublishOutputPath, "SimpleMvc.pdb");
+            Assert.FileDoesNotExist(result, PublishOutputPath, "SimpleMvc.PrecompiledViews.dll");
+            Assert.FileDoesNotExist(result, PublishOutputPath, "SimpleMvc.PrecompiledViews.pdb");
+        }
+
         [Fact]
         [InitializeTestProject("SimpleMvc")]
         public async Task Publish_SkipsCopyingBinariesToOutputDirectory_IfCopyBuildOutputToOutputDirectory_IsUnset()