[#2375] fix broke errors list -> string

ckan/templates/development/primer.html

@@ -30,7 +30,7 @@
     {% snippet 'development/snippets/simple-input.html', heading='Facet List', show_icons=true %}
 
     {% snippet 'development/snippets/form.html' %}
-    {% snippet 'development/snippets/form.html', error='This field has an error' %}
+    {% snippet 'development/snippets/form.html', error=['This field has an error'] %}
 
     <section class="module">
       <div class="module-content">

ckan/templates/macros/form.html

@@ -46,7 +46,7 @@
       <label class="checkbox" for="{{ id or name }}">
         <input id="{{ id or name }}" type="checkbox" name="{{ name }}" value="{{ value | e }}" {{ "checked " if checked }}{{ attributes(attrs) }} />
         {{ label or name }}
-        {% if error %}<strong class="error-inline">{{ error }}</strong>{% endif %}
+        {% if error %}<strong class="error-inline">{{ error|join(', ') }}</strong>{% endif %}
       </label>
     </div>
   </div>
@@ -140,7 +140,7 @@
     <div class="input-prepend">
       {% if prepend %}<span class="add-on">{{ prepend }}</span>{%- endif -%}
       <input id="{{ id or name }}" type="{{ type }}" name="{{ name }}" value="{{ value | e }}" placeholder="{{ placeholder }}" />
-      {% if error %}<span class="error-block">{{ error }}</span>{% endif %}
+      {% if error %}<span class="error-block">{{ error|join(', ') }}</span>{% endif %}
     </div>
   {% endcall %}
 {% endmacro %}
@@ -214,7 +214,7 @@
     <label class="control-label" for="{{ for }}">{{ label or _('Custom') }}</label>
     <div class="controls{{ " " ~ control_classes | join(' ') }}">
       {{ caller() }}
-      {% if error %}<span class="error-block">{{ error }}</span>{% endif %}
+      {% if error %}<span class="error-block">{{ error|join(', ') }}</span>{% endif %}
     </div>
   </div>
 {% endmacro %}