Traceback when analysing OVAL from shared/checks/oval directory

python3 ./ctf/content_test_filtering.py pr --verbose --rule --output json 7635

```
DEBUG OVALAnalysis - Analyzing OVAL file /shared/checks/oval/var_firewall_package_is_nftables.xml
DEBUG OVALAnalysis - Rule name: var_firewall_package_is_nftables
DEBUG DiffStruct - rule.yml was not found for var_firewall_package_is_nftables
Traceback (most recent call last):
File "/__w/content/content/./ctf/content_test_filtering.py", line 44, in
diff_structure = diff_analysis.analyse_file(file_record)
File "/__w/content/content/ctf/ctf/diff_analysis.py", line 54, in analyse_file
return file_analyzer.process_analysis()
File "/__w/content/content/ctf/ctf/analysis/OVALAnalysis.py", line 235, in process_analysis
self.diff_struct.add_changed_product_by_rule(self.rule_name, msg=msg)
File "/__w/content/content/ctf/ctf/DiffStruct.py", line 122, in add_changed_product_by_rule
product_name = self.get_rule_products(rule_name)
File "/__w/content/content/ctf/ctf/DiffStruct.py", line 89, in get_rule_products
with open(ruleyml_path) as f:
TypeError: expected str, bytes or os.PathLike object, not NoneType
```