state-reproducibility-flush seems to unconditionally fail if the plugin has zero parameters with CLAP_PARAM_IS_AUTOMATABLE flag

[alien-brother]

If the plugin has zero parameters with CLAP_PARAM_IS_AUTOMATABLE flag, it seems that state-reproducibility-flush does the following:

• Calls flush() with zero events in the in-list.
• Calls state_save().
• Fails.

Now, not setting the CLAP_PARAM_IS_AUTOMATABLE flag was probably an error on my part, but the behaviour of the check was not clear until I saw #15.

[robbert-vdh]

What exactly is failing here? All tests pass when I run it on https://github.com/robbert-vdh/nih-plug/tree/master/plugins/examples/midi_inverter, which doesn't have any parameters at all.

[alien-brother]

Can confirm that if I force that count() of clap_plugin_params_t returns 0, the test passes. It fails for me if count() is not zero, but none of the present parameters have CLAP_PARAM_IS_AUTOMATABLE flag.

I'm using the binary release of 0.3.2 on Windows.

Edit. This is the failure message:

 FAILED: 'clap_plugin_params::flush()' has been called with random parameter
   values, but the plugin's reported parameter values have not changed.

I assume it comes from

clap-validator/src/tests/plugin/state.rs

Lines 323 to 328 in f1d444e

	if expected_param_values == initial_param_values && !param_infos.is_empty() {
	anyhow::bail!(
	"'clap_plugin_params::flush()' has been called with random parameter values, but \
	the plugin's reported parameter values have not changed."
	)
	}