Add no results help text.

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

mayan/apps/linking/icons.py

@@ -2,6 +2,11 @@ from __future__ import absolute_import, unicode_literals
 
 from appearance.classes import Icon
 
+icon_smart_link_condition_create = Icon(
+    driver_name='fontawesome', symbol='plus'
+)
+icon_smart_link_condition = Icon(driver_name='fontawesome', symbol='code')
+icon_smart_link_create = Icon(driver_name='fontawesome', symbol='plus')
 icon_smart_link_instances_for_document = Icon(
     driver_name='fontawesome', symbol='link'
 )