Don't ignore non-fatal parser errors when analysis succeeds

[sbillig]

What was wrong?

closes #523

Non-fatal parser errors were being ignored when the analysis stage succeeded. I assume this was my fault again (#402 😞). We probably need tests for the driver crate.

How was it fixed?

In the simplest way possible. I've done nothing to ensure that something similar won't happen again in the future.

To-Do

• Add entry to the release notes (may forgo for trivial changes)

[codecov-commenter]

Codecov Report

Merging #535 (8397eee) into master (e256045) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
- Coverage   87.68%   87.67%   -0.02%     
==========================================
  Files          87       87              
  Lines        5670     5672       +2     
==========================================
+ Hits         4972     4973       +1     
- Misses        698      699       +1     

Impacted Files	Coverage Δ
crates/driver/src/lib.rs	75.00% <50.00%> (-1.32%)	⬇️

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