Fail upload task if it can't find files to upload

Author: nmburgan

tasks/upload.rake

@@ -18,7 +18,7 @@ namespace :vox do
 
     prepend = File.directory?('/cygdrive/') ? 'C:/cygwin64/' : ''
     files = Dir.glob("#{prepend}#{__dir__}/../output/*#{munged_tag}*#{platform}*")
-    puts 'No files for the given tag found in the output directory.' if files.empty?
+    abort 'No files for the given tag found in the output directory.' if files.empty?
 
     path = "s3://#{bucket}/#{repo}/#{args[:tag]}"
     files.each do |f|