Remove PHP Warnings - various undefined variables and typos

e107_files/shortcode/admin_plugins.sc

@@ -13,6 +13,7 @@ if (ADMIN) {
 				}
 			}
 		}
+		if (is_array($e107_plug)) {
 			foreach(array_keys($e107_plug) as $xplug){
 				if (file_exists(e_PLUGIN.$e107_plug[$xplug]."/admin_info.php")) {
 					if ($pref['admin_alerts_uniquemenu'] == 1) {
@@ -31,6 +32,7 @@ if (ADMIN) {
 					$i++;
 				}
 			}
+		}
     
 		$caption = LAN_head_6;