Disable download button if videos not downloadable, closes #244

templates/macros.html

@@ -125,7 +125,7 @@ $(function() {
 
 {% macro video_download_btn(videos) %}
  {% if not ismod() %}
-<span class="btn btn-default dropdown-toggle{% if videos|length is equalto 0 %} disabled{% endif %}" type="button" data-toggle="dropdown">Download <span class="caret"></span></span>
+<span class="btn btn-default dropdown-toggle{% if not videos|selectattr('downloadable')|list and not ismod() %} disabled{% endif %}" type="button" data-toggle="dropdown">Download <span class="caret"></span></span>
 <ul class="dropdown-menu">
 	{% for v in videos|sort(attribute='prio', reverse=True) if (v.downloadable or ismod() ) %}
 		<li><a href="{{ config.VIDEOPREFIX }}/{{v.path}}">{{v.format_description}} ({{v.file_size|filesizeformat(true)}})</a></li>