cmp code_desc missing operation and expected valid

[alexpop]

Having the following spec file:

describe 6 do
  it { should cmp 6 }
end

describe 7 do
  it { should cmp '7' }
end

describe 8 do
  it { should cmp <= '10' }
end

describe 9 do
  it { should cmp == 9 }
end

I get the following exec output with inspec 1.1.0(latest):

$ be inspec exec ~/tmp/cmp.rb
Target:  local://

  6 should
     ✔  cmp 6
  7 should
     ✔  cmp "7"
  8 should
     ✔  cmp
  9 should
     ✔  cmp

^ see the missing operator and value for 8 & 9

The code change in this PR produces the following exec output:

$ be inspec exec ~/tmp/cmp.rb
Target:  local://

  6 should
     ✔  cmp == 6
  7 should
     ✔  cmp == "7"
  8 should
     ✔  cmp <= "10"
  9 should
     ✔  cmp == 9

8 & 9 have operator and value 🎉

[arlimus]

Awesome bugfix, kudos @alexpop 👍