Don't show image trigger on dc/nationalparks

[ganto]

When following the workshop the trigger was removed before creating the nationalparks-pipeline. Therefore it shouldn't' show up, when listing the deploymentconfig.

See https://github.com/osevg/workshopper-content/blame/master/pipelines.adoc#L297

[siamaksade]

The pipeline module might not be included in the workshop and in that case the image trigger would be there.

This should be done in a conditional statement:

{% if modules.pipelines %}
dc list without trigger
{% else %}
dc list with trigger
{% endif %}

[ganto]

Thanks for the feedback. Adjusted code accordingly.