doctor: use respond_to? instead of NoMethodError

Closes Homebrew/homebrew#47715.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Library/Homebrew/cmd/doctor.rb

@@ -21,13 +21,13 @@ module Homebrew
 
     first_warning = true
     methods.each do |method|
-      begin
-        out = checks.send(method)
-      rescue NoMethodError
+      unless checks.respond_to?(method)
         Homebrew.failed = true
         puts "No check available by the name: #{method}"
         next
       end
+
+      out = checks.send(method)
       unless out.nil? || out.empty?
         if first_warning
           $stderr.puts <<-EOS.undent