Fix cfn delete stack functionality

moto/cloudformation/parsing.py

@@ -403,19 +403,18 @@ class ResourceMap(collections.Mapping):
         while remaining_resources and tries < 5:
             for resource in remaining_resources.copy():
                 parsed_resource = self._parsed_resources.get(resource)
-                if parsed_resource:
-                    try:
+                try:
+                    if parsed_resource and hasattr(parsed_resource, 'delete'):
                         parsed_resource.delete(self._region_name)
-                    except Exception as e:
-                        # skip over dependency violations, and try again in a second pass
-                        last_exception = e
-                    else:
-                        remaining_resources.remove(resource)
+                except Exception as e:
+                    # skip over dependency violations, and try again in a second pass
+                    last_exception = e
+                else:
+                    remaining_resources.remove(resource)
             tries += 1
         if tries == 5:
             raise last_exception
 
-
 class OutputMap(collections.Mapping):
     def __init__(self, resources, template):
         self._template = template

tests/test_cloudformation/test_cloudformation_stack_crud.py

@@ -27,8 +27,23 @@ dummy_template2 = {
     "Resources": {},
 }
 
+# template with resource which has no delete attribute defined
+dummy_template3 = {
+    "AWSTemplateFormatVersion": "2010-09-09",
+    "Description": "Stack 3",
+    "Resources": {
+        "VPC": {
+            "Properties": {
+                "CidrBlock": "192.168.0.0/16",
+        },
+        "Type": "AWS::EC2::VPC"
+        }
+    },
+}
+
 dummy_template_json = json.dumps(dummy_template)
 dummy_template_json2 = json.dumps(dummy_template2)
+dummy_template_json3 = json.dumps(dummy_template3)
 
 
 @mock_cloudformation
@@ -220,6 +235,19 @@ def test_delete_stack_by_id():
     conn.describe_stacks(stack_id).should.have.length_of(1)
 
 
+@mock_cloudformation
+def test_delete_stack_with_resource_missing_delete_attr():
+    conn = boto.connect_cloudformation()
+    conn.create_stack(
+        "test_stack",
+        template_body=dummy_template_json3,
+    )
+
+    conn.list_stacks().should.have.length_of(1)
+    conn.delete_stack("test_stack")
+    conn.list_stacks().should.have.length_of(0)
+
+
 @mock_cloudformation
 def test_bad_describe_stack():
     conn = boto.connect_cloudformation()