SqlSetup: When Test-TargetResource does not find any features it should says so more clearly

Details of the scenario you tried and the problem that is occurring:
When Test-TargetResource does not find any features it just outputs 'Features found:'. Maybe we should output 'Features found: None' so it's more clear that no features was found.

The DSC configuration that is using the resource (as detailed as possible):

        SqlSetup 'InstallNamedInstance-INST2016'
        {
            InstanceName          = 'INST2014'
            Features              = 'SQL'
            SQLCollation          = 'SQL_Latin1_General_CP1_CI_AS'
            SourcePath            = 'c:\temp\Sxs\SQL2014'
            UpdateEnabled         = 'False'
            ForceReboot           = $false
            BrowserSvcStartupType = 'Automatic'
            PsDscRunAsCredential  = $SqlInstallCredential
        }

Version of the Operating System, SQL Server and PowerShell the DSC Target Node is running:
n/a

What module (SqlServer or SQLPS) and which version of the module the DSC Target Node is running:
n/a

Version of the DSC module you're using, or 'dev' if you're using current dev branch:
Dev

Start by locating the SqlSetup Test-TargetResource code that produces the "Features found:" output. Update the empty-result wording to make clear that no features were found, then verify the resulting message through the relevant resource test or command output.