Fix NullPointerException in PartialDimExtractionFn by explicity checking for dimValue == null
Fix NullPointerException in PartialDimExtractionFn by explicity checking for dimValue == null, attempt 2
Merge pull request #943 from mrijke/partialdimextractfn-nullpointer

Fix NullPointerException in PartialDimExtractionFn