Use abort(message) instead of puts and exit

Author: znz

lib/rdoc/ri/driver.rb

@@ -1554,8 +1554,7 @@ def start_server
     begin
       require 'webrick'
     rescue LoadError
-      puts "webrick is not found. You may need to `gem install webrick` to install webrick."
-      exit
+      abort "webrick is not found. You may need to `gem install webrick` to install webrick."
     end
 
     server = WEBrick::HTTPServer.new :Port => @server

lib/rdoc/servlet.rb

@@ -7,8 +7,7 @@
 begin
   require 'webrick'
 rescue LoadError
-  puts "webrick is not found. You may need to `gem install webrick` to install webrick."
-  exit
+  abort "webrick is not found. You may need to `gem install webrick` to install webrick."
 end
 
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