Updated Definition format (markdown)

Definition-format.md

@@ -379,6 +379,9 @@ search:
     - path: xxx.php
       # only use it if we're searching for porn
       categories: [901, 902]
+  # [OPTIONAL] If a key resolves to a value that is empty then Cardigann will not use that key/value pair in its query to the site.
+    In the event that the site requires a key without a value then use this override. The default is false.
+  allowEmptyInputs: true
   # list of HTTP arguments which are used by all paths
   inputs:
     # Generate the category[] arguments list