Deprecated functionality: strlen(): Passing null to parameter #1 ($string) of type string is deprecated about magento-lts

[ADDISON74]

This issue involves several files that need to be modified.

In the Profiles page, this one with the grid, if we press the [Add New Profile] we get the error mentioned in the initial post. In the closed PR you changed the file correctly

/app/code/core/Mage/Adminhtml/Block/System/Convert/Gui/Edit/Tab/Wizard.php

Line 95

        if ($value === null) {
            return $default;
        }

With this change, we get the page where we can create a new profile. If we fill in the "Name" and press any of the [Save] buttons, another error will appear at the top

Deprecated functionality: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/app/code/core/Mage/Dataflow/Model/Profile.php on line 89

[ADDISON74]

I would fix that deprecated error as follows

/app/code/core/Mage/Dataflow/Model/Profile.php
Line 89

BEFORE

        if (strlen($actionsXML) < 0 &&

AFTER

        if (strlen($actionsXML ?? '') < 0 &&

The two changes seem to solve this issue.