@exclude tag causes error if no resource of that type exists in plan

[pontinjx]

Description :
If a test is defined with an exludes tag but no resource of that type is defined anywhere in the plan, then terraform-compliance errors with ERROR: Hook 'exclude_resources' from /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/terraform_compliance/steps/terrain.py:85 raised: 'AttributeError: 'Context' object has no attribute 'stash''

To Reproduce

1. Sample terraform main.tf

resource "aws_s3_bucket" "my_s3_bucket" {
   bucket = "my-bucket"
}

2. terraform init && terraform plan -out plan.out && terraform-compliance -p plan.out -f features
3. Run using pip package
4. Error output:

Feature: Load balancer should use certain policies for HTTPS  # /Users/***/features/naughty.feature

    @exclude_aws_lb_listener.listener_to_exclude
    Scenario: Load balancer should use certain policies for HTTPS
        💡 SKIPPING: Can not find aws_lb_listener defined in target terraform plan.
        Given I have aws_lb_listener defined

1 features (0 passed, 1 skipped)
1 scenarios (0 passed, 1 skipped)
6 steps (0 passed, 1 skipped)
Run 1618825783 finished within a moment
❗ ERROR: Hook 'exclude_resources' from /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/terraform_compliance/steps/terrain.py:85 raised: 'AttributeError: 'Context' object has no attribute 'stash''

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/radish/hookregistry.py", line 132, in call
    func(model, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/terraform_compliance/steps/terrain.py", line 97, in exclude_resources
    for resource in step.context.stash:
AttributeError: 'Context' object has no attribute 'stash'

5. <Your feature/scenario/steps>

Feature: Load balancer should use certain policies for HTTPS
    @exclude_aws_lb_listener.listener_to_exclude
    Scenario: Load balancer should use certain policies for HTTPS
        Given I have aws_lb_listener defined
        When its port is 443
        When its protocol is HTTPS
        When it has ssl_policy
        Then it must have ssl_policy
        And its value must match the "ffoo-with-tls-1-2|bar-with-tls-1-2|etc-with-tls-1-2" regex

Expected behavior :
The tests should pass since no non-compliant LB listener is defined in the plan.

Tested versions :

• <terraform-compliance version (terraform-compliance -v)> - present in 1.3.13 and 1.3.14
• <terraform version (terraform -v)> - tested with 0.12.29 and 0.13.6
• <python runtime version, if running as a python package (python --version)> - tested with 3.8.1

Additional context
N/A

[Kudbettin]

Hi @pontinjx ,

Does the issue still persist?

[pontinjx]

Hi, this is working for me now in 1.3.15 - thanks very much!