Notices and warnings in layout_builder_modal_link_alter

After add or update the block (view listing, in particular) in a layout override getting such messages in the dblog:

Notice: Undefined index: class in layout_builder_modal_link_alter() (line 57 of /var/www/web/modules/contrib/layout_builder_modal/layout_builder_modal.module)
#0 /var/www/web/core/includes/bootstrap.inc(600): _drupal_error_handler_real(8, 'Undefined index...', '/var/www/web/mo...', 57, Array)
#1 /var/www/web/modules/contrib/layout_builder_modal/layout_builder_modal.module(57): _drupal_error_handler(8, 'Undefined index...', '/var/www/web/mo...', 57, Array)
.....

Warning: in_array() expects parameter 2 to be array, null given in layout_builder_modal_link_alter() (line 57 of /var/www/web/modules/contrib/layout_builder_modal/layout_builder_modal.module)
#0 /var/www/web/core/includes/bootstrap.inc(600): _drupal_error_handler_real(2, 'in_array() expe...', '/var/www/web/mo...', 57, Array)
#1 [internal function]: _drupal_error_handler(2, 'in_array() expe...', '/var/www/web/mo...', 57, Array)

The problem is that there are not enough checks in the above hook implementation.