Correct xml

Author: goggle

addon.xml

@@ -7,8 +7,7 @@
     <import addon="script.module.youtube_channels" version="0.1.0"/>
     <import addon="script.module.kodi-six" version="0.0.2"/>
   </requires>
-  <extension point="xbmc.python.module" library="lib">
-  </extension>
+  <extension point="xbmc.python.module" library="lib"/>
   <extension point="xbmc.addon.metadata">
     <summary lang="en_GB">Access the SRG SSR media libraries.</summary>
     <summary lang="de_DE">Zugriff auf die Mediatheken von SRG SSR.</summary>