Find how/when google tokens become invalid when updating the module.

[DiegoPino]

Once, after updating this module in production from an old branch, google auth based tokens failed because of bad formatting or missing pieces of its expected structure. Happens that the structure of this tokens is a full set of array keys and values, and probably something gets invalidated during an admin update. Weird is that it is not missing, it is just corrupt.

I was not able to trigger this issue on purpose, but if this happens, you will see this

InvalidArgumentException: Invalid token format in Google_Client->setAccessToken() (line 434 of /var/www/drupal/sites/all/modules/islandora_multi_importer/vendor/google/apiclient/src/Google/Client.php).

I need to deal with this and bring this error into an action people can correct using simple and documented steps. Right now the solution is to go to IMI´s admin menu, click the URL link under
"Leave as is if you want to keep the existing value or Enter from this URL." to renew the initial token that is used by google´s API to regenerate tokens once they expire. Once that is done and the new token is copied into the form and saved, operation can continue as before without any issues. This never fails during ingest operation or if leaf unattended long time.