Handle empty tags

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

layouts/toolbox-index-page.njk

@@ -11,25 +11,27 @@
           <ol class="toolbox">
             {%- for tool in toolbox | sort -%}
               {%- set tags = tool.data.tags | excludeItem('tool') | sort -%}
-              <li class="tool" data-tags="{{ tags }}">
-                <p>
-                  <a href="{{ tool.url | url }}">{{ tool.data.title }}</a>
-                </p>
-                {%- if tags -%}
-                  <div>
-                    Tagged with
-                    <ul class="tags">
-                      {%- for tag in tags -%}
-                        <li class="tag">
-                          <a href="/tag/{{ tag }}" rel="tag">
-                            {{ tag }}
-                          </a>
-                        </li>
-                      {%- endfor -%}
-                    </ul>
-                  </div>
-                {%- endif -%}
-              </li>
+							{%- if tags | length > 0 -%}
+                <li class="tool" data-tags="{{ tags }}">
+                  <p>
+                    <a href="{{ tool.url | url }}">{{ tool.data.title }}</a>
+                  </p>
+                  {%- if tags -%}
+                    <div>
+                      Tagged with
+                      <ul class="tags">
+                        {%- for tag in tags -%}
+                          <li class="tag">
+                            <a href="/tag/{{ tag }}" rel="tag">
+                              {{ tag }}
+                            </a>
+                          </li>
+                        {%- endfor -%}
+                      </ul>
+                    </div>
+                  {%- endif -%}
+                </li>
+						  {%- endif -%}
             {%- endfor -%}
           </ol>
         {%- endif -%}