Al is valid and smaller than 3

Reviewed-on: #99

cms/add_show_json.php

@@ -255,7 +255,7 @@ logextra( "Host ID was found \"$host_id\"" );
 
 $provided_host_name = urldecode( $decoded_json["host_name"] );
 
-if ( empty( $provided_host_name ) or strlen( $provided_host_name ) < 3 or strlen( $provided_host_name ) > 50 ) {
+if ( empty( $provided_host_name ) or strlen( $provided_host_name ) < 2 or strlen( $provided_host_name ) > 50 ) {
   problem("host_name length is not correct");
 }