add config.php defines for twitter, only enable twitter pane when they are filled in

config.php-dist

@@ -174,6 +174,11 @@
 	define('ENABLE_TWEET_BUTTON', false);
 	// Enable 'tweet this' button for articles
 
+	define('CONSUMER_KEY', '');
+	define('CONSUMER_SECRET', '');
+	// Your OAuth instance authentication information for Twitter, visit
+	// http://twitter.com/oauth_clients to register your instance.
+
 	define('CONFIG_VERSION', 20);
 	// Expected config version. Please update this option in config.php
 	// if necessary (after migrating all new options from this file).

modules/pref-feeds.php

@@ -1329,6 +1329,8 @@
 
 		print "</div>"; #pane
 
+		if (defined('CONSUMER_KEY') && CONSUMER_KEY != '') {
+
 			print "<div id=\"pref-feeds-twitter\" dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Twitter')."\">";
 	
 			$result = db_query($link, "SELECT COUNT(*) AS cid FROM ttrss_users
@@ -1352,7 +1354,9 @@
 				onclick=\"return clearTwitterCredentials()\">".
 				__("Clear stored credentials")."</button>";
 	
-		print "</div>";
+			print "</div>"; # pane
+
+		}
 
 		print "</div>"; #container