Undefined array key warnings and htmlspecialchars() deprecated messages

[vmanthos]

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Describe the bug

The following appear in the debug.log after the changes in #722

PHP Warning:  Undefined array key "orderby" in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-list-table.php on line 102
PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-list-table.php on line 102
PHP Warning:  Undefined array key "order" in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-list-table.php on line 103
PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-list-table.php on line 103
PHP Warning:  Undefined array key "status-filter" in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-list-table.php on line 1034
PHP Warning:  Undefined array key "option_page" in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-settings.php on line 134
PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/example.com/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-settings.php on line 134

To Reproduce

Steps to reproduce the behavior:

1. Go to Imagify's settings page, change one of the settings, and save the changes.
2. Visit the "Other Media" page: Media > "Other Media".
3. Check the debug.log.

Expected behavior

No warnings should be there in the debug.log.

Screenshots
N/A

Additional context
N/A

Backlog Grooming (for WP Media dev team use only)

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[Mai-Saad]

Can reproduce the following error using PHP 8.2 and 753

[12-Jul-2023 10:41:48 UTC] PHP Warning:  Undefined array key "option_page" in /var/www/new.rocketlabsqa.ovh/htdocs/wp-content/plugins/imagify/inc/classes/class-imagify-settings.php on line 134
[12-Jul-2023 10:41:48 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/new.rocketlabsqa.ovh/htdocs/wp-content/plugins/imagify/inc/classes/class-imagify-settings.php on line 134

Scenario1:
steps:
1- use a wrong API key
2- correct the API key and save

Scenario2: => even without step 1 , we have the same error on newlabs
1- delete AS actions table
2- fresh install and activate of this PR 753