A few months ago, I ran the Contour tool on two separate DEMs (one was smoothed and the other wasn't). The contour interval was set to 1m.
Today, I noticed that there were several features created with NULL geometry.
I created a field called partCount and populated it with the following python expression:
and then I applied the following query to my dataset:
You can see, there are several features with no parts and zero length.
However, they did get an elevation value.
My question is: why would the Contour tool create features with null geometry?
Note: the DEMs did contain No Data areas, but I'm not yet convinced this is the cause of the null geometry.
I created the contours in ArcGIS 10.3.1.