fix(@ngtools/webpack): respect noEmitOnError within AotPlugin

Author: clydin

packages/@ngtools/webpack/src/loader.ts

@@ -621,7 +621,7 @@ export function ngcLoader(this: LoaderContext & { _compilation: any }, source: s
 
           const result = refactor.transpile(compilerOptions);
 
-          if (plugin.failedCompilation) {
+          if (plugin.failedCompilation && plugin.compilerOptions.noEmitOnError) {
             // Return an empty string to prevent extra loader errors (missing imports etc).
             // Plugin errors were already pushed to the compilation errors.
             cb(null, '');

packages/@ngtools/webpack/src/plugin.ts

@@ -202,6 +202,11 @@ export class AotPlugin implements Tapable {
       this._compilerOptions.mapRoot = undefined;
     }
 
+    // Default noEmitOnError to true
+    if (this._compilerOptions.noEmitOnError !== false) {
+      this._compilerOptions.noEmitOnError = true;
+    }
+
     // Compose Angular Compiler Options.
     this._angularCompilerOptions = Object.assign(
       { genDir },