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@version = nil is used to handle depends_on :xcode or depends_on xcode: :build.

Converting this to empty string ("") causes

Error: Version must not be empty
Warning: Removed Sorbet lines from backtrace!
Rerun with `--verbose` to see the original backtrace
/opt/homebrew/Library/Homebrew/version.rb:499:in 'Version#initialize'
/opt/homebrew/Library/Homebrew/requirements/xcode_requirement.rb:40:in 'Class#new'
/opt/homebrew/Library/Homebrew/requirements/xcode_requirement.rb:40:in 'XcodeRequirement#message'