Merge pull request #1413 from snosratiershad/hotfix/allow_blank_secret_key

fix: allow blank secret key

Author: fviard

S3/Config.py

@@ -272,7 +272,8 @@ def __init__(self, configfile = None, access_key=None, secret_key=None, access_t
                     self.aws_credential_file()
 
             # override these if passed on the command-line
-            if access_key and secret_key:
+            # Allow blank secret_key
+            if access_key and secret_key is not None:
                 self.access_key = access_key
                 self.secret_key = secret_key
             if access_token: