the img dom element is: <img src="nullimg/icons/camel/endpoint24.png" alt="">

the nullimg seems strange

for icons of the tree working we have:

<span class="dynatree-icon">
::before
</span>

with css content:

span.org-apache-camel-context span.dynatree-icon:before {
content: url(img/icons/camel/camel_context_icon.png);
}