Short code cleanup.

laydi/annotations.py

@@ -18,10 +18,7 @@ def set_dim_handler(dimname, handler):
 def get_dim_handler(dimname):
     """Get the handler for the given dimension."""
     global _dim_annotation_handlers
-    if _dim_annotation_handlers.has_key(dimname):
-        return _dim_annotation_handlers[dimname]
-    else: 
-        return None
+    return _dim_annotation_handlers.get(dimname, None)
 
 
 class AnnotationHandler: