fix(@angular-devkit/schematics): export additional exception

cf. angular/angular-cli#10467

Author: hansl

packages/angular_devkit/schematics/tools/index.ts

@@ -12,7 +12,10 @@ export * from './file-system-host';
 export * from './workflow/node-workflow';
 
 export { FileSystemEngineHost } from './file-system-engine-host';
-export { NodeModulesEngineHost } from './node-module-engine-host';
+export {
+  NodeModulesEngineHost,
+  NodePackageDoesNotSupportSchematics,
+} from './node-module-engine-host';
 export { NodeModulesTestEngineHost } from './node-modules-test-engine-host';
 
 export { validateOptionsWithSchema } from './schema-option-transform';