Fixing bad method parameter

archiva-modules/archiva-base/archiva-repository-api/src/main/java/org/apache/archiva/repository/content/ItemSelector.java

 
     String getAttribute( String key );
 
-    String getExtension( String extension );
+    String getExtension( );
 
     Map<String, String> getAttributes( );
 

archiva-modules/archiva-base/archiva-repository-layer/src/main/java/org/apache/archiva/repository/content/base/ArchivaItemSelector.java

     }
 
     @Override
-    public String getExtension( String extension )
+    public String getExtension(  )
     {
-        return null;
+        return extension;
     }
 
     @Override