Lokale Contao Installation bei MAMP schlägt fehl: "exception occured … figure out your platform version"

Problembeschreibung:

Contao lässt sich lokal nicht installieren und bricht mit folgender Fehlermeldung ab.

An exception occured while establishing a connection to figure out your platform version.
You can circumvent this by setting a 'server_version' configuration value.
For further information have a look at: https://github.com/doctrine/DoctrineBundle/issues/673
 
In AbstractMySQLDriver.php line 93:
An exception occurred in driver: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)

Lösung / Workaround