Avoid catalog compilation error because of augeas
When augeas-tools is not installed, catalog compilation fails with the following error:
Error: Could not call 'find' on 'catalog': Error 500 on SERVER:
Server Error: Evaluation Error: Error while evaluating a Resource
Statement, Evaluation Error: Error while evaluating a Function Call,
'versioncmp' parameter 'a' expects a String value, got Undef (file:
/etc/puppet/code/environments/production/modules/augeas/manifests/lens.pp,
line: 61, column: 24)