Check for a nil header value

Author: zeroSteiner

plugins/request.rb

@@ -137,7 +137,7 @@ def parse_args_http(args = [], type = 'http')
           return [nil, opt_parser]
         when '-H'
           name, value = val.split(':', 2)
-          options[:headers][name] = value.strip
+          options[:headers][name] = value.to_s.strip
         when '-i'
           options[:print_headers] = true
         when '-I'