Replace uses of error debug message with a thrown error

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (425468a) 0.32% compared to head (5b4ed3d) 0.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #231 +/- ## ====================================== Coverage 0.32% 0.32% ====================================== Files 14 14 Lines 932 932 ====================================== Hits 3 3 Misses 929 929 ``` | [Impacted Files](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/231?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff) | Coverage Δ | | |---|---|---| | [src/differentiation/jaches\_products.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/231?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2RpZmZlcmVudGlhdGlvbi9qYWNoZXNfcHJvZHVjdHMuamw=) | `0.00% <0.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff)

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