mruby/mruby — pull request #828 by mattn (2013-02-07 07:37:59+00:00)
Title: Ignore empty gem

For example, I hope to add hack code to mrbgem.rake to customize my new tasks.

```ruby
desc "update all git based mrbgems"
task :updategems do
MRuby.each_target do
if enable_gems?
gems.each do |g|
# git pull origin master
end
end
end
end
```