only call jsonForm if there are params.

Author: robkooper

app/views/extractions/submitFileExtraction.scala.html

@@ -80,7 +80,9 @@ <h1>Submit file for extraction</h1>
                         <script>
                                 var params = JSON.parse("@Json.stringify(e.parameters)".replace(/&quot;/g, "\""));
                                 var selector = "#@(e.name.replaceAll("\\.", "_"))_parameters";
-                                $(selector).jsonForm(params);
+                                if (Object.keys(params).length != 0) {
+                                    $(selector).jsonForm(params);
+                                }
                         </script>
                     }
                 </tbody>