during dump_redacted_config(): config keys may not be dictionaries

[cedricbu]

INFO:Redacting sensitive information from configuration ./config/config-template-nessus.yaml
Traceback (most recent call last):
  File "/home/cedric/prodsec/rapidast/rapidast/./rapidast.py", line 292, in <module>
    run()
  File "/home/cedric/prodsec/rapidast/rapidast/./rapidast.py", line 232, in run
    dump_rapidast_redacted_configs(config_file, full_result_dir_path)
  File "/home/cedric/prodsec/rapidast/rapidast/./rapidast.py", line 183, in dump_rapidast_redacted_configs
    if not dump_redacted_config(main_config_file_location, destination_dir):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/cedric/prodsec/rapidast/rapidast/./rapidast.py", line 158, in dump_redacted_config
    if config[key].get("authentication") and config[key]["authentication"].get("parameters"):
       ^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'get'

This happens when loading the currently proposed config nessus template (https://github.com/RedHatProductSecurity/rapidast/blob/nessus/config/config-template-nessus.yaml).

The issue is that some root config (e.g.: general in particular) may be empty, which is translated into None by the YAML translator.

The following modification would resolve it, I think:

156         logging.info(f"Redacting sensitive information from configuration {config_file_location}")                                                                                         
157         for key in config.keys():                                                                                                                                                          
158             if isinstance(config[key], dict) and config[key].get("authentication") and config[key]["authentication"].get("parameters"):                                                                                      
159                 for param in config[key]["authentication"]["parameters"]:                                                                                                                  
160                     config[key]["authentication"]["parameters"][param] = "*****"