Dont set zeros in matrix from nodal bcs
Dont set zeros in matrix from nodal bcs

a test case where two variables are not truly coupled. Global AD
indexing only adds into Jacobian during kernel evaluation if there is a
non-zero dependence. Then we close before nodal bcs, and the matrix
shrinks, eliminating all the off-diagional memory. Then this stupid
NodalBC::offDiagJacobian tries to set matrix value for all jvar even if
its zero, causing a new nonzero

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