Merge pull request #6728 from MikeMcQuaid/upgrade-indempotent
upgrade: don't error if already installed.
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						460da9f80d
					
				@ -75,13 +75,13 @@ module Homebrew
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      (ARGV.resolved_formulae - outdated).each do |f|
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					      (ARGV.resolved_formulae - outdated).each do |f|
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        versions = f.installed_kegs.map(&:version)
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					        versions = f.installed_kegs.map(&:version)
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        if versions.empty?
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					        if versions.empty?
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          onoe "#{f.full_specified_name} not installed"
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					          ofail "#{f.full_specified_name} not installed"
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        else
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					        else
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          version = versions.max
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					          version = versions.max
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          onoe "#{f.full_specified_name} #{version} already installed"
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					          opoo "#{f.full_specified_name} #{version} already installed"
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        end
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					        end
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      end
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					      end
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      exit 1 if outdated.empty?
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					      exit
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    end
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					    end
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    pinned = outdated.select(&:pinned?)
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					    pinned = outdated.select(&:pinned?)
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