refactor(builders): improve error message when no routes have been found

modules/builders/src/prerender/index.spec.ts

@@ -40,7 +40,7 @@ describe('Prerender Builder', () => {
   it('fails with error when no routes are provided', async () => {
     const run = await architect.scheduleTarget(target, { routes: [], guessRoutes: false });
     await expectAsync(run.result).toBeRejectedWith(
-      jasmine.objectContaining({ message: jasmine.stringMatching(/No routes found/)})
+      jasmine.objectContaining({ message: jasmine.stringMatching(/Could not find any routes to prerender/)})
     );
     await run.stop();
   });

modules/builders/src/prerender/index.ts

@@ -143,7 +143,7 @@ export async function execute(
 ): Promise<PrerenderBuilderOutput> {
   const routes = await getRoutes(options, context);
   if (!routes.length) {
-    throw new Error('No routes found.');
+    throw new Error(`Could not find any routes to prerender.`);
   }
 
   const result = await _scheduleBuilds(options, context);

modules/builders/src/prerender/render.ts

@@ -76,7 +76,7 @@ async function getServerBundle(bundlePath: string) {
       }
     } catch (e) {
       if (process.send) {
-        process.send({ success: false, error: e, outputIndexPath });
+        process.send({ success: false, error: e.message, outputIndexPath });
       }
     }
   }