Fix bug when clicking one catering after another that all values were added to old sum incl. catering
Fix bug when clicking one catering after another that all values were added to old sum incl. catering

Now the new catering values are added to the location values without having
any prior catering values in the sum.

aCandidMind/inemaa_event-tool,aCandidMind/inemaa_event-tool