orm: enforce that queries always return a Result, a query-resulting array can be used as a V array in place. (#17871)

tutorials/building_a_simple_web_blog_with_vweb/code/blog/article.v

@@ -9,5 +9,5 @@ struct Article {
 pub fn (app &App) find_all_articles() []Article {
 	return sql app.db {
 		select from Article
-	}
+	} or { []Article{} }
 }

tutorials/building_a_simple_web_blog_with_vweb/code/blog/blog.v

@@ -18,7 +18,7 @@ fn main() {
 	}
 	sql app.db {
 		create table Article
-	}
+	}!
 	vweb.run(app, 8081)
 }
 
@@ -61,7 +61,7 @@ pub fn (mut app App) new_article(title string, text string) vweb.Result {
 	println(article)
 	sql app.db {
 		insert article into Article
-	}
+	} or {}
 
 	return app.redirect('/')
 }