Fix for empty strings

packages/app.sql

@@ -1501,6 +1501,7 @@ CREATE OR REPLACE PACKAGE BODY app AS
         -- parse arguments
         v_args := app.get_request_url(in_arguments_only => TRUE);
         --
+        IF v_args IS NOT NULL THEN
             BEGIN
                 SELECT JSON_OBJECTAGG (
                     REGEXP_REPLACE(REGEXP_SUBSTR(v_args, '[^&]+', 1, LEVEL), '[=].*$', '')
@@ -1511,8 +1512,9 @@ CREATE OR REPLACE PACKAGE BODY app AS
                 ORDER BY LEVEL;
             EXCEPTION
             WHEN OTHERS THEN
-            app.log_error('JSON_ERROR');
+                app.log_error('JSON_ERROR', v_args);
             END;
+        END IF;
 
         -- create log
         RETURN app.log__ (