Change to using EmptyDirectory's 'exist?'

Author: vcavallo

lib/thor/actions/inject_into_file.rb

@@ -57,7 +57,7 @@ def invoke!
           replacement + '\0'
         end
 
-        if File.exist?(destination)
+        if exists?
           replace!(/#{flag}/, content, config[:force])
         else
           raise MalformattedArgumentError, "The file #{ destination } does not appear to exist"