formula_desc: handle nil first character.
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@ -87,7 +87,7 @@ module RuboCop
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first_word = string_content(node).split.first
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unless VALID_LOWERCASE_WORDS.include?(first_word)
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first_char = first_word.to_s.chars.first
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correction.sub!(/^(['"]?)([a-z])/, "\\1#{first_char.upcase}")
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correction.sub!(/^(['"]?)([a-z])/, "\\1#{first_char.upcase}") if first_char
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end
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correction.sub!(/^(['"]?)an?\s/i, "\\1")
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correction.gsub!(/(ommand ?line)/i, "ommand-line")
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