After successful, bare install of 3.0.0, clicking on Preferences -> Trying to access array offset on value of type null error

[bzerangue]

FIRST, I updated the files per your fixes here. #2911

AND Symphony 3.0.0 installed successfully on PHP 7.4.4 / MySQL 5.7.29 / Ubuntu 18.04.

THEN, after logging in when I clicked on Preferences, I receive this ERROR...

Symphony Notice: Trying to access array offset on value of type null
An error occurred in /app/symphony/lib/toolkit/email-gateways/email.sendmail.php around line 145

140      *  All configuration entries stored in a single array. The array should have the format of the $_POST array created by the preferences HTML.
141      * @return void
142      */
143     public function setConfiguration($config)
144     {
145         $this->setFrom($config['from_address'], $config['from_name']);
146     }
147 
148     /**
149      * Builds the preferences pane, shown in the symphony backend.

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Affected Symphony version(s) : 3.0.0
PHP version(s) : 7.4.4
MySQL version(s): 5.7.29
OS(es) : Ubuntu 18.04

Please follow the guideline for security bug disclosure https://github.com/symphonycms/symphonycms/wiki/Security-Bug-Disclosure