Throw on fatal error.

[1uc]

If nmodl sends invalid code to SymPy, SymPy we throw an exception. NMODL ignores the issue, prints a warning; and them much later fails. Typical output might be:

[NMODL] [warning] :: SympySolverVisitor :: solve_non_lin_system python exception: Sympify of expression 'could not parse 'is'' failed, because of exception being raised:
SyntaxError: invalid syntax (<string>, line 1)
[NMODL] [warning] :: SympySolverVisitor :: solve_non_lin_system python exception: Sympify of expression 'could not parse 'is'' failed, because of exception being raised:
SyntaxError: invalid syntax (<string>, line 1)
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
[NMODL] [error] :: NeuronSolveVisitor :: solver method 'sparse' not supported
terminate called after throwing an instance of 'std::runtime_error'
  what():  PRIME encountered during code generation, ODEs not solved?
Aborted

The first two lines are important, the next 20+ lines are spam; and the final error message is outright misleading.

Therefore, this PR proposes to simply throw if SymPy fails.

[bbpbuildbot]

Logfiles from GitLab pipeline #210641 (:no_entry:) have been uploaded here!

Status and direct links:

• ✅ spack_setup
• ✅ build:intel
• ✅ build:nvhpc
• ⛔ test:intel
• ⛔ test:nvhpc