Bug 1254395 - push to cdn for non release promotion case doesn't use credentials, DONTBUILD a=testing r=nthomas

MozReview-Commit-ID: AYbMZVNxwo

--HG--
extra : source : 1cc5ec520c00a6b8168162fb2db7299cc1b6f343
extra : amend_source : c13805754c1d9115887680ce59b1ae0fe7739381

testing/mozharness/scripts/release/push-candidate-to-releases.py

@@ -77,7 +77,7 @@ class ReleasePusher(BaseScript, VirtualenvMixin):
             self.fatal("aws creds found in env and self.config. please declare in one place only.")
 
         # set aws credentials
-        if aws_creds:
+        if all(aws_creds):
             self.aws_key_id, self.aws_secret_key = aws_creds
         else:  # use
             self.aws_key_id, self.aws_secret_key = None, None