added a more descriptive "not found" page

journalmarks/journalmarks.py

@@ -228,7 +228,7 @@ def get_journalmark(tag):
                 (Journalmark.tag == tag) & (Journalmark.user == flask_g.user)
             ).get()
     except DoesNotExist:
-        return ('tag not found', 404, None)
+        return render_template('not_found.html')
     return render_template('get_journalmark.html', j=j)
 
 

journalmarks/templates/not_found.html

@@ -0,0 +1,15 @@
+{% extends "base.html" %}
+{% block script %}
+<style>
+p {
+    text-align: center;
+}
+</style>
+{% endblock %}
+{% block body %}
+<h1>Journalmark not found</h1>
+
+<p>There is no Journalmark with the provided tag code.</p>
+
+<p><a href="{{ url_for('journalmarks.index') }}">Back to welcome page</a></p>
+{% endblock %}