Improve test/check_buildstock.rb

[vtnate]

• [x] Return all errors found, not just the first one
  • Is it possible to continue running after an error is found?
• [x] Return only the error message, not the full stack trace
• [x] Clarify which options_lookup.csv file is the appropriate one to check against
• [x] Catch error related to all blank options for a parameter