BUG #13824. Calculator can now work when cell/point arrays are missing.

Calculator should be able to work even when cell/point arrays are not present in
the dataset. This fixes that issue.

Change-Id: Iea733f07feac4b1a108413c56e1d626cd7f9a1a5
Merge topic '13824_fix_calculator' into next

8cc2480 BUG #13824. Calculator can now work when cell/point arrays are missing.