Specific strategies configuration not working

[cyMarvin]

I just checked out the extension and like the idea pretty much.
Since I usually don't use PWA I tried to set the extension up without this strategy according to the documentation.

Unfortunately, this was kind of a hassle since I could not overwrite the array in AdditionalConfiguration.php and had to create a local extension just to overwrite the default settings.

I think providing an ext_conf_template.txt would be a better way to handle this.

Anyways, after I removed 'pwa' from the configuration array I got an exception executing the task.

Maybe the column should be nullable? Or save the value Google returns and just hide it in the statistics?
To keep on working, I just inserted the record manually and set pwa_score to 0.

Therefore, I now get to see a score of 0.
When excluding a strategy it would be nice to hide it in the backend.