don't get qrcode when creating a new objective

app/templates/objective.html

@@ -9,7 +9,7 @@
 
 {% block app_content %}
 
-{% if objective.hash is none %}
+{% if not objective.hash %}
 <h1>Add Objective</h1>
 {% elif objective.name == '' %}
 <h1>Objective</h1>
@@ -34,9 +34,11 @@
                     <button class="btn btn-danger">Delete</button></a>
                 {% endif %}
             </div>
+            {% if objective.hash %}
             <div class="row">
                 <img src="{{ url_for('objective_qrcode', objective_hash=objective.hash) }}" alt="qr_code_failed", width="100%">
             </div>
+            {% endif %}
         {% else %}
             <h2>latitude: {{ objective.latitude }}</h2>
             <h2>longitude: {{ objective.longitude }}</h2>