in the debug component, display top-level pareameters as well as row-level ones.

This also fixes a surprising behavior when starting a file without a component selection.

Author: lovasoa

examples/official-site/sqlpage/migrations/06_debug.sql

@@ -2,7 +2,7 @@
 INSERT INTO component (name, description, icon)
 VALUES (
         'debug',
-        'Display all of the row-level parameters passed to the component. Useful for debugging: just replace the name of the component you want to debug with ''debug''.',
+        'Display all the parameters passed to the component. Useful for debugging: just replace the name of the component you want to debug with ''debug''.',
         'bug'
     );
 -- Insert an example usage of the http_header component into the example table

sqlpage/templates/debug.handlebars

@@ -1,4 +1,5 @@
 <h2>Debug output</h2>
+<pre>{{stringify this}}</pre>
 {{#each_row}}
     <pre>{{stringify this}}</pre>
 {{/each_row}}