Allow badge type to be empty

app/views/badges/award.html.erb

@@ -32,7 +32,7 @@
       <div class="grid--cell is-6 is-12-sm">
         <div class="form-caption">Entity Type</div>
         <%= f.select :badge_source_type, options_for_select(@entity_types, selected: []),
-                     { include_blank: false }, class: 'form-element' %>
+                     { include_blank: true }, class: 'form-element' %>
       </div>
       <div class="grid--cell is-6 is-12-sm">
         <div class="form-caption">Id of the entity</div>