[integ-tests] Improve _get_resources_with_image_resource

When the resource first appears, the PhysicalResourceId might not be available. Therefore, this commit improves the function to wait until PhysicalResourceId is available

Signed-off-by: Hanwen <hanwenli@amazon.com>

Author: hanwen-cluster

tests/integration-tests/tests/iam/test_iam_image.py

@@ -93,7 +93,7 @@ def _get_resources_with_image_resource(cfn_client, stack_name):
     image_resource_exists = False
     logging.info("Checking image resource")
     for resource in resources:
-        if resource["ResourceType"] == "AWS::ImageBuilder::Image":
+        if resource["ResourceType"] == "AWS::ImageBuilder::Image" and resource.get("PhysicalResourceId"):
             image_resource_exists = True
             logging.info("The image resource exists!")
             break