Check if app is enabled before exporting its data

lib/migrate.php

@@ -406,6 +406,8 @@ class OC_Migrate{
 
 		// Foreach provider
 		foreach( self::$providers as $provider ){
+			// Check if the app is enabled
+			if( OC_App::isEnabled( $provider->getID() ) ){
 				$success = true;
 				// Does this app use the database?
 				if( file_exists( OC::$SERVERROOT.'/apps/'.$provider->getID().'/appinfo/database.xml' ) ){
@@ -435,7 +437,7 @@ class OC_Migrate{
 				// Now add some app info the the return array
 				$appinfo = OC_App::getAppInfo( $provider->getID() );
 				$return['apps'][$provider->getID()]['version'] = OC_App::getAppVersion($provider->getID());
-
+			}
 		}
 
 		return $return;