Some more light fixes, plus fix the subnode "404".

app/db.py

@@ -182,8 +182,12 @@ def subnodes_by_user(user):
     return subnodes
 
 def subnode_by_uri(uri):
-    subnode = [subnode for subnode in all_subnodes() if subnode.uri == uri][0]
-    return subnode
+    subnode = [subnode for subnode in all_subnodes() if subnode.uri == uri]
+    if subnode:
+        return subnode[0]
+    else:
+        # TODO: handle.
+        return False
 
 def nodes_by_outlink(wikilink):
     nodes = [node for node in all_nodes() if wikilink in node.outlinks]

app/templates/node_rendered.html

@@ -17,13 +17,16 @@
 {% extends "base.html" %}
 {% block content %}
 {% if not subnodes %}
-No node found for '{{wikilink}}'. 
+<div class="message">
+No node found at [[{{wikilink}}]]. 
 <br /><br />
-If you <a href="https://flancia.org/go/agora">contributed a subnode</a> named '{{wikilink}}' to the Agora, this node would not be empty :)
+If you <a href="https://flancia.org/go/agora">contributed a subnode</a> named '{{wikilink}}' to the Agora, this node would exist :)
 <br /><br />
-Go back to <a href="/nodes">/nodes</a>?
+Try listing <a href="/nodes">nodes</a> or perhaps <a href="/search">search</a>.
+</div>
 {% endif %}
 
+{% if subnodes %}
 <div class="node">
 <span class="node-header"><strong>Node</strong> <a href="/node/{{wikilink}}">[[{{wikilink}}]]</a></span>
 
@@ -41,5 +44,6 @@ Go back to <a href="/nodes">/nodes</a>?
 <a href="{{subnode.url}}">{{subnode.wikilink}}</a> by <a href="/@{{subnode.user}}">@{{subnode.user}}</a><br />
 {% endfor %}
 </div>
+{% endif %}
 
 {% endblock %}

app/templates/subnode_rendered.html

@@ -17,11 +17,14 @@
 {% extends "base.html" %}
 {% block content %}
 {% if not subnode %}
+<div class="message">
 No subnode found matching '{{subnode}}'. 
 <br /><br />
-Go back to <a href="/nodes">/nodes</a>, <a href="/subnodes">/nodes</a>?
+Try listing <a href="/subnodes">subnodes</a> or perhaps <a href="/search">search</a>.
+</div>
 {% endif %}
 
+{% if subnode %}
 <div class="subnode">
     <span class="subnode-header"><strong>Subnode</strong> <a href="{{subnode.url}}">{{subnode.uri}}</a> by <a href="/@{{subnode.user}}">@{{subnode.user}}</a> in <a href="/node/{{subnode.wikilink}}">[[{{subnode.wikilink}}]]</a></span>
 {{ subnode.content|markdown|linkify|safe }}
@@ -29,5 +32,6 @@ Go back to <a href="/nodes">/nodes</a>, <a href="/subnodes">/nodes</a>?
 
 <div class="backlinks">
     <span class="backlinks-header">To see backlinks, go up to node <a href="/node/{{subnode.wikilink}}">[[{{subnode.wikilink}}]]</a>.</span> 
+{% endif %}
 
 {% endblock %}