Undefined index warnings in ECheck

We're not properly checking the objects that get returned when getting a settled batch list in via cron.

The warnings are :

 [warning] Undefined property: stdClass::$batchList Echeck.php:199
 [warning] Attempt to read property "batch" on null Echeck.php:199
 [warning] Undefined property: stdClass::$batchList Echeck.php:207
 [warning] Attempt to read property "batch" on null Echeck.php:207
 [warning] foreach() argument must be of type array|object, null given Echeck.php:207

Todo:
Add checks to prevent the warnings.