The Route Shape is unable to recognize null values. If a document with a null value is sent into a route shape, there are several methods that should be able to recognize a null value, but nothing seems to work.
To compare a null value, select the incoming data for the First Value, set the Decision shape as Equal To
and for the Second Value, add a Static Value and leave the value field blank.
For Dell Boomi Support only: Refer to the example process at this link (run on test atom cloud - it works!)