[Bug] Various errors in etcd controls

[aoggz]

Describe the bug
Encountering various errors when executing etcd controls (2.*).

Expected behavior
I expect to receive passed/failed/skipped results based on observed system & application state.

Actual behavior

undefined method `empty?' error encountered in controls 2.1, 2.2, 2.4, & 2.5:

...
×  cis-kubernetes-benchmark:2.1: Ensure that the --cert-file and --key-file arguments are set as appropriate (4 failed)
  ×  ["/usr/bin/etcd -name=...\"] is expected to match /--cert-file=/
  ...
  ×  Enviroment variables for Processes /\/usr\/bin\/etcd/ ETCD_CERT_FILE
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000006453908>
   
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000005d4c6a0>
  ×  ["/usr/bin/etcd -name=...\"]" to match /--key-file=/
  ...
  ×  Enviroment variables for Processes /\/usr\/bin\/etcd/ ETCD_KEY_FILE
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x000000000643f250>
   
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000005d1bb18>
×  cis-kubernetes-benchmark:2.2: Ensure that the --client-cert-auth argument is set to true (2 failed)
  ×  ["/usr/bin/etcd -name=...\"]" to match /--client-cert-auth=true/
  ...
  ×  Enviroment variables for Processes /\/usr\/bin\/etcd/ ETCD_CLIENT_CERT_AUTH
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000006125a10>
   
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000005bc9198>
  ...
×  cis-kubernetes-benchmark:2.4: Ensure that the --peer-cert-file and --peer-key-file arguments are set as appropriate (4 failed)
  ×  ["/usr/bin/etcd -name=...\"]" to match /--peer-cert-file=/
  ...
  ×  Enviroment variables for Processes /\/usr\/bin\/etcd/ ETCD_PEER_CERT_FILE 
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000006303e90>

  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000005ba25e8>
  ×  ["/usr/bin/etcd -name=...\"] is expected to match /--peer-key-file=/
  ...
  ×  Enviroment variables for Processes /\/usr\/bin\/etcd/ ETCD_PEER_KEY_FILE 
  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000005e12378>

  undefined method `empty?' for #<#<Class:0x000000000443df60>:0x0000000005b901b8>
...

The last result in each control is the issue.

Control Source Code Error encountered in control 2.7:

×  cis-kubernetes-benchmark:2.7: Ensure that a unique Certificate Authority is used for etcd
 ×  Control Source Code Error cis-kubernetes-benchmark-1.0.2/controls/2_etcd_node.rb:133
 undefined local variable or method `cis_level' for #<Inspec::Rule:0x0000000005d64138>

Example code

inspec exec https://github.com/dev-sec/cis-kubernetes-benchmark/archive/1.0.2.tar.gz --color --show-progress -i ~/.ssh/id_rsa --chef-license=accept --no-create-lockfile --bastion-user=bastion_user --bastion-host=bastion.dev.com -t=ssh://user@server.dev.com

OS / Environment

Linux ... 3.10.0-1160.15.2.el7.x86_64 #1 SMP Wed Feb 3 15:06:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Inspec Version

4.26.4

Baseline Version

6a960bc7872df07ee38876c5cb750f6637ff026b