Appearance: Remove unused form_empty_label flag

This is superseded by the empty results template.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -10,6 +10,7 @@
   querystring keys
 - Dependencies: Update Python dependencies version. Remove django suit
   as a dependency.
+- Appearance: Remove unused form_empty_label flag.
 
 3.1.9 (2018-11-01)
 ==================

mayan/apps/appearance/templates/appearance/generic_form_subtemplate.html

@@ -58,11 +58,7 @@
                     {% include 'appearance/generic_form_instance.html' %}
                 {% empty %}
                     <tr><td class="text-center" colspan=99>
-                        {% if form_empty_label %}{{ form_empty_label }}{% else %}
-
                         {% include 'appearance/no_results.html' %}
-
-                        {% endif %}
                     </td></tr>
                 {% endfor %}