Stability improvement

This is a follow-up to [7601](https://github.com/gitlabhq/gitlabhq/pull/7601). I'm not sure if there's a possibility of such case, but anyway...
Maybe it is a good idea to keep it here. The URI does have possibility to raise an error. 

> On Sep 9, 2014, at 6:12 AM, Yuriy Glukhov <notifications@github.com> wrote:
> 
> In app/helpers/projects_helper.rb:
> 
> >      result
> > +  rescue
> > +    original_url
> I am not sure also. My concern was that URI ctor would throw in case of invalid URI. It seems that invalid URI is handled elsewhere, though. I'll remove rescue, if you still think it's not needed here.
> 
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