Exceptions with nil message shouldn't cause issues

[st0012]

closes #1323

[codecov-io]

Codecov Report

Merging #1327 (c22932c) into master (7989855) will increase coverage by 0.62%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1327      +/-   ##
==========================================
+ Coverage   98.08%   98.70%   +0.62%     
==========================================
  Files         208      113      -95     
  Lines        9088     5260    -3828     
==========================================
- Hits         8914     5192    -3722     
+ Misses        174       68     -106     

Impacted Files	Coverage Δ
...try-ruby/lib/sentry/interfaces/single_exception.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/hub_spec.rb	100.00% <100.00%> (ø)
sentry-rails/lib/sentry/rails/active_job.rb	96.87% <0.00%> (-0.10%)	⬇️
...-sidekiq/spec/sentry/sidekiq/error_handler_spec.rb	100.00% <0.00%> (ø)
...ven/breadcrumbs/active_support_breadcrumbs_spec.rb
...ry-raven/spec/raven/interfaces/stack_trace_spec.rb
...ven/spec/raven/utils/exception_cause_chain_spec.rb
sentry-raven/spec/raven/configuration_spec.rb
sentry-raven/lib/raven/integrations/delayed_job.rb
...ations/rails/overrides/debug_exceptions_catcher.rb
... and 89 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7989855...c22932c. Read the comment docs.