Improved SLAGet() to fix bug# 2111 - Error when deleting a sla which is linked to an other object using link object 2.
Improved SLAGet() to fix bug# 2111 - Error when deleting a sla which is linked to an other object using link object 2.

otrs-xx/otrs,otrs-xx/otrs,otrs-xx/otrs,otrs-xx/otrs