Raise error when an invalid URI is received

[alexpop]

It changes how the audit cookbook informs the end user when an invalid Compliance Server URL is provided:

Recipe: audit::default
 * ruby_block[exchange_refresh_token] action run

   ================================================================================
   Error executing action `run` on resource 'ruby_block[exchange_refresh_token]'
   ================================================================================

   NoMethodError
   -------------
   undefined method `+' for nil:NilClass

   Cookbook Trace:
   ---------------
   /tmp/kitchen/cache/cookbooks/audit/libraries/compliance.rb:8:in `retrieve_access_token'
   /tmp/kitchen/cache/cookbooks/audit/recipes/default.rb:34:in `block (2 levels) in from_file'
   /tmp/kitchen/cache/cookbooks/compat_resource/files/lib/chef_compat/monkeypatches/chef/runner.rb:78:in `run_action'
   /tmp/kitchen/cache/cookbooks/compat_resource/files/lib/chef_compat/monkeypatches/chef/runner.rb:106:in `block (2 levels) in converge'
   /tmp/kitchen/cache/cookbooks/compat_resource/files/lib/chef_compat/monkeypatches/chef/runner.rb:106:in `each'
   /tmp/kitchen/cache/cookbooks/compat_resource/files/lib/chef_compat/monkeypatches/chef/runner.rb:106:in `block in converge'
   /tmp/kitchen/cache/cookbooks/compat_resource/files/lib/chef_compat/monkeypatches/chef/runner.rb:105:in `converge'

to:

Recipe: audit::default
  * ruby_block[exchange_refresh_token] action run

    ================================================================================
    Error executing action `run` on resource 'ruby_block[exchange_refresh_token]'
    ================================================================================

    RuntimeError
    ------------
    Unable to parse URI: ap-cc6.opschef.tv/login

[chris-rock]

Thanks @alexpop for this improvement