From 525d1ac27da028d47c4a7aa41d88c70f18515a4f Mon Sep 17 00:00:00 2001
From: William Ma <whoiswillma@gmail.com>
Date: Fri, 3 Jul 2020 10:33:38 -0400
Subject: [PATCH] Fix PR issues

---
 Library/Homebrew/cli/args.rb      | 5 ++---
 Library/Homebrew/cmd/reinstall.rb | 2 +-
 Library/Homebrew/cmd/uninstall.rb | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/Library/Homebrew/cli/args.rb b/Library/Homebrew/cli/args.rb
index 7f76690df7..927703327d 100644
--- a/Library/Homebrew/cli/args.rb
+++ b/Library/Homebrew/cli/args.rb
@@ -246,12 +246,11 @@ module Homebrew
         require "formula"
         require "missing_formula"
 
-        raise UsageError if name.empty?
+        raise UsageError if name.blank?
 
         rack = Formulary.to_rack(name.downcase)
 
         dirs = rack.directory? ? rack.subdirs : []
-
         raise NoSuchKegError, rack.basename if dirs.empty?
 
         linked_keg_ref = HOMEBREW_LINKED_KEGS/rack.basename
@@ -278,7 +277,7 @@ module Homebrew
             Keg.new(prefix)
           end
         rescue FormulaUnavailableError
-          raise <<~EOS
+          raise MultipleVersionsInstalledError, <<~EOS
             Multiple kegs installed to #{rack}
             However we don't know which one you refer to.
             Please delete (with rm -rf!) all but one and then try again.
diff --git a/Library/Homebrew/cmd/reinstall.rb b/Library/Homebrew/cmd/reinstall.rb
index d5e4a972ae..037260a2ea 100644
--- a/Library/Homebrew/cmd/reinstall.rb
+++ b/Library/Homebrew/cmd/reinstall.rb
@@ -75,7 +75,7 @@ module Homebrew
 
     Homebrew.messages.display_messages
 
-    return if casks.empty?
+    return if casks.blank?
 
     reinstall_cmd = Cask::Cmd::Reinstall.new(casks)
     reinstall_cmd.verbose = args.verbose?
diff --git a/Library/Homebrew/cmd/uninstall.rb b/Library/Homebrew/cmd/uninstall.rb
index ad5f823dbf..2cb101b296 100644
--- a/Library/Homebrew/cmd/uninstall.rb
+++ b/Library/Homebrew/cmd/uninstall.rb
@@ -123,7 +123,7 @@ module Homebrew
       end
     end
 
-    return if casks.empty?
+    return if casks.blank?
 
     cask_uninstall = Cask::Cmd::Uninstall.new(casks)
     cask_uninstall.force = args.force?