fix multiple calls to reset/stop/delete projection

[prolic]

resolves #138
see: prooph/event-store#329 (this has to be merged an released first, so we have tests included)

/cc @oqq

[coveralls]

Coverage remained the same at 90.395% when pulling 84826f2 on fix_projection_managers into b89aad8 on master.

[oqq]

This change seems to work for me. But you should consider the usage of PDO::MYSQL_ATTR_FOUND_ROWS if possible to prevent this second query.

[prolic]

Nice hint, let me try that....

[prolic]

I tried this:

        if (0 === $statement->rowCount() && 0 === $statement->getAttribute(PDO::MYSQL_ATTR_FOUND_ROWS)) {
            throw ProjectionNotFound::withName($name);
        }

result:

PDOStatement::getAttribute(): SQLSTATE[IM001]: Driver does not support this function: This driver doesn't support getting attributes