fixup! fix(@angular/build): report TypeScript declaration emit diagnostics

Author: alan-agius4

packages/angular/build/src/tools/angular/compilation/aot-compilation.ts

@@ -568,14 +568,10 @@ export class AotCompilation extends TypeScriptCompilation {
           break;
         }
         if ('kind' in affectedEmitResult.affected) {
-          if (affectedEmitResult.result.diagnostics.length > 0) {
-            declarationDiagnostics.set(
-              affectedEmitResult.affected,
-              affectedEmitResult.result.diagnostics,
-            );
-          } else {
-            declarationDiagnostics.delete(affectedEmitResult.affected);
-          }
+          declarationDiagnostics.set(
+            affectedEmitResult.affected,
+            affectedEmitResult.result.diagnostics,
+          );
         }
       }
     } else if (compilerOptions.tsBuildInfoFile) {
@@ -619,11 +615,7 @@ export class AotCompilation extends TypeScriptCompilation {
           transformers,
         );
         if (!hasEmittedDts) {
-          if (emitResult.diagnostics.length > 0) {
-            declarationDiagnostics.set(sourceFile, emitResult.diagnostics);
-          } else {
-            declarationDiagnostics.delete(sourceFile);
-          }
+          declarationDiagnostics.set(sourceFile, emitResult.diagnostics);
         }
         continue;
       }