add grad_phi_zero and grad_test_zero #15204
Labels
C: Framework
P: normal
A defect affecting operation with a low possibility of significantly affects.
T: task
An enhancement to the software.
Reason
It's a convenience helpful to create mesh dimension independent code
Design
add two constant variable
_grad_phi_zero
_grad_test_zero
Impact
Nope, just an additional feature
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