bitbake: utils.py: don't use len() for truth value testing.

(Bitbake rev: 4bdfeab7845bdcd62a4928200dd13701414a464e)

Signed-off-by: Oscar Utbult <oscar@oscr.io>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/utils.py

@@ -522,7 +522,7 @@ def filter_environment(good_vars):
         os.unsetenv(key)
         del os.environ[key]
 
-    if len(removed_vars):
+    if removed_vars:
         logger.debug(1, "Removed the following variables from the environment: %s", ", ".join(removed_vars.keys()))
 
     return removed_vars