remove old import statement

pelican/contents.py

@@ -5,7 +5,6 @@ import logging
 import functools
 
 from datetime import datetime
-from os import getenv
 from sys import platform, stdin
 
 
@@ -15,6 +14,7 @@ from pelican import signals
 
 logger = logging.getLogger(__name__)
 
+
 class Page(object):
     """Represents a page
     Given a content, and metadata, create an adequate object.