Handle article not found

view/app.py

@@ -84,7 +84,7 @@ def index():
     diffs = db.fetchall()
 
     html = render_template(
-        "./index.html",
+        "index.html",
         diffs=diffs,
         page=page,
         pagination=pagination,
@@ -104,8 +104,12 @@ def article_detail(article_id: str):
     db = get_db().cursor()
     db.execute("SELECT * FROM diffs WHERE article_id = ?", (article_id,))
     result = db.fetchall()
+
+    if len(result) == 0:
+        return make_response(render_template("not_found.html"), 404)
+
     article_url = result[0]["article_url"]
-    # TODO: Handle if nothing is found and return 404 in that case.
+
     return render_template(
         "article_detail.html",
         article_id=article_id,

view/templates/not_found.html

@@ -0,0 +1,8 @@
+{% extends "base.html" %}
+
+{% block body %}
+<div class="container my-6 flex items-center gap-2">
+	<p class="text-4xl">😭</p>
+	<h1 class="text-xl font-medium">Nenalezeno</h1>
+</div>
+{% endblock body %}