Update rules to check for empty block

[vatsalgit5118]

For the terraform template, if the user defines the empty block then the rule isn't able to validate it and compliance gets passed.

[rezoan]

@vatsalgit5118 if you declare an empty auth_settings in tf file. can you please confirm in the resource snapshot json, does it create

"auth_settings" : [
    { }
  ]

or

"auth_settings": [
 ]

[rezoan]

expected json output snapshot should be for empty block:

"auth_settings" : [
    { }
  ]

[jaiminswan]

Need to review again