Use default value getattr when checking for paging params

When checking to make sure that no paging params are set, we
did not account for the possibility that page size isn't present
for a given operation. Thus, errors would be raised when
`--no-paginate` was supplied on operations without it. This sets
a default value to the getattr call to prevent the error.

Fixes aws#1993

.changes/next-release/bugfix-Paginator.json

@@ -0,0 +1,5 @@
+{
+  "description": "Fixed a bug where specifying `--no-paginate` on an operation without a page size parameter raised an error. Fixes `#1993 <https://github.com/aws/aws-cli/issues/1993>`__.",
+  "category": "Paginator",
+  "type": "bugfix"
+}

awscli/customizations/paginate.py

@@ -193,7 +193,7 @@ def ensure_paging_params_not_set(parsed_args, shadowed_args):
     paging_params = ['starting_token', 'page_size', 'max_items']
     shadowed_params = [p.replace('-', '_') for p in shadowed_args.keys()]
     params_used = [p for p in paging_params if
-                   p not in shadowed_params and getattr(parsed_args, p)]
+                   p not in shadowed_params and getattr(parsed_args, p, False)]
 
     if len(params_used) > 0:
         converted_params = ', '.join(

tests/functional/cloudformation/test_describe_stacks.py

@@ -0,0 +1,22 @@
+# Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+#     http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+from awscli.testutils import BaseAWSCommandParamsTest
+
+
+class TestDescribeStacks(BaseAWSCommandParamsTest):
+
+    prefix = 'cloudformation describe-stacks'
+
+    def test_no_paginate(self):
+        cmdline = self.prefix + ' --no-paginate'
+        self.assert_params_for_cmd(cmdline)