Skip palette option for jscolor when empty

Author: jan-szejko-steelseries

colorfield/templates/colorfield/color.html

@@ -4,6 +4,6 @@
  name="{{ name }}"
  value="{% firstof value default '' %}"
  placeholder="{% firstof value default '' %}"
- data-jscolor="{hash:true,width:225,height:150,format:'{{ format }}',required:{% if required %}true{% else %}false{% endif %},paletteCols:4,paletteHeight:28,palette:{{ palette|safe }}}"
+ data-jscolor="{hash:true,width:225,height:150,format:'{{ format }}',required:{% if required %}true{% else %}false{% endif %},paletteCols:4,paletteHeight:28{% if palette %},palette:{{ palette|safe }}{% endif %}}"
  {% if disabled %}disabled{% endif %}
  {% if required %}required{% endif %} />