Fixed search config bug and selfsearch results page

htdocs/admin/extensions/pluginconfig.php

@@ -41,7 +41,7 @@ if ($plugintype == 'artefact') {
     $classname = generate_artefact_class_name($type);
 }
 else {
-    $type = null;
+    $type = '';
     $classname = generate_class_name($plugintype, $pluginname);
 }
 

htdocs/selfsearch.php

@@ -36,7 +36,7 @@ $enc_noresults  = json_encode(get_string('noresultsfound'));
 
 $javascript = <<<EOF
 var results = new TableRenderer(
-    'selfsearchresults',
+    'searchresults',
     $enc_jsonscript,
     []
 );