exe/hrw in hrw-0.3.8 vs exe/hrw in hrw-0.3.9

@@ -34,9 +34,13 @@
   puts '[-] can not detect package manager, skip'
   exit(0)
 end
 
 specs = scanner.scan
+if specs.empty?
+  puts '[-] no packages found'
+  exit(0)
+end
 
 api = Hrw::API.new(options.url)
 hash = api.submit(specs, scanner.package_manager)
 result = api.retrieve(hash)