Fix Dana's comments, round two!

Author: paddycarver

google/resource_app_engine_application.go

@@ -163,6 +163,7 @@ func resourceAppEngineApplicationCreate(d *schema.ResourceData, meta interface{}
 	// Wait for the operation to complete
 	waitErr := appEngineOperationWait(config.clientAppEngine, op, project, "App Engine app to create")
 	if waitErr != nil {
+		d.SetId("")
 		return waitErr
 	}
 	log.Printf("[DEBUG] Created App Engine App")

google/resource_google_project.go

@@ -209,9 +209,7 @@ func appEngineFeatureSettingsResource() *schema.Resource {
 
 func resourceGoogleProjectCustomizeDiff(diff *schema.ResourceDiff, meta interface{}) error {
 	if old, _ := diff.GetChange("app_engine.0.location_id"); diff.HasChange("app_engine.0.location_id") && old != nil && old.(string) != "" {
-		// if location_id was already set, and has a new value, that forces a new app
-		// if location_id wasn't set, don't force a new value, as we're just enabling app engine
-		return diff.ForceNew("app_engine.0.location_id")
+		return fmt.Errorf("Cannot change app_engine.0.location_id once the app is created.")
 	}
 	return nil
 }