Puppet: Package removal and ensure stopped

I'm pretty new to Puppet, but I really like it thus far. Right now I'm currently setting it up to automate a small architecture.

I have one problem though -- I want to remove a package, and ensure that it is stopped. To accomplish this, I have the following entry in my manifest:

package { 'supervisor':
    ensure => absent,
}

service { 'supervisor':
    ensure     => stopped,
    enable     => false,
    hasstatus  => true,
}

The problem with this is that once the manifest been applied to the node once, I get the following error upon next run:

debug: Service[supervisor](provider=debian): Could not find supervisor in /etc/init.d
debug: Service[supervisor](provider=debian): Could not find supervisor.sh in /etc/init.d
err: /Stage[main]/Screenly_core/Service[supervisor]: Could not evaluate: Could not find init script for 'supervisor'

Is there any way to do some kind of conditional statement, such that the stop-procedure only gets executed if the package was indeed present (and then run prior to the package removal)?

On debian based systems (and I assume also on rpm systems) removing a package stops its services before deleting files (prerm phase in deb packages).

But what you ask can be achieved by inserting a dependency with 'require'

package { 'supervisor':
    ensure => absent,
    require => Service["supervisor"],
}

service { 'supervisor':
    ensure     => stopped,
    enable     => false,
    hasstatus  => true,
}