Update pi1/class.tx_dmmjobcontrol_pi1.php

change line 851 to
} elseif (is_array($TCA['tx_dmmjobcontrol_job']['columns'][$field]['config']['items'])) {
otherwise the following foreach() function throws errors in typo3 backend log using Typo3 4.5.23 + PHP5.2
Merge pull request #9 from heikohaensge/patch-1

Update pi1/class.tx_dmmjobcontrol_pi1.php