Warn on screen ERB error

[jmthomas]

closes #660

[jmthomas]

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.05 ⚠️

Comparison is base (3bf6d9c) 74.77% compared to head (3c31830) 74.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #677      +/-   ##
==========================================
- Coverage   74.77%   74.72%   -0.05%     
==========================================
  Files         454      455       +1     
  Lines       28412    28432      +20     
  Branches      545      545              
==========================================
+ Hits        21244    21247       +3     
- Misses       7084     7101      +17     
  Partials       84       84              

Flag	Coverage Δ
frontend	77.42% <ø> (-0.20%)	⬇️
ruby-api	51.31% <ø> (-0.06%)	⬇️
ruby-backend	78.41% <0.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
openc3/lib/openc3/models/target_model.rb	73.42% <0.00%> (-0.29%)	⬇️
openc3/lib/openc3/utilities/process_manager.rb	27.84% <0.00%> (-0.73%)	⬇️

... and 11 files with indirect coverage changes

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