Hi,
when using lhs() or rhs() on an expression that happens to have no lhs or
rhs, e.g.,
{ 0 } * dxeverywhere
those routines will return
<empty Form>
When passing this to assemble(), it'll complain with
========= *snip* =========
[...]
RuntimeError: Form is empty. Cannot pass to JIT compiler.
========= *snap* =========
I posted something related as a bug,
https://bitbucket.org/fenics-project/dolfin/issue/44/assemble-0-vectors.
Any quick and dirty workaround known for this? (e.g., how do I test if a
form is empty?)
--Nico
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