Message::fromFile and Message::fromString methods cause a type error

[a8mp]

Describe the bug When using the Message::fromFile and Message::fromString methods in some unit tests, it causes a type error - TypeError : Cannot assign null to property Webklex\PHPIMAP\Message::$config of type array. I have noticed the Message::fromFile method is used in your unit tests so I ran some of those and they also fail.

Used config Default

Code to Reproduce Run the unit test webklex/php-imap/tests/issues/Issue275Test.php and it will fail

Expected behavior A new message should be returned from either of these methods

Screenshots N/A

Desktop / Server (please complete the following information):

• OS: MacOs 13.2.1
• PHP: 8.1.22
• Version - v.5.5.0
• Provider - N/A