builder: fix a situation where entrypoint was improperly set in stringform

oh whoops thanks

On Oct 7, 2014, at 3:52 PM, Tibor Vass <notifications@github.com> wrote:

> In builder/dispatchers.go:
> 
> > @@ -258,10 +258,13 @@ func cmd(b *Builder, args []string, attributes map[string]bool) error {
> >  //
> >  func entrypoint(b *Builder, args []string, attributes map[string]bool) error {
> >  	b.Config.Entrypoint = handleJsonArgs(args, attributes)
> > +	log.Debugf("%#v %#v %#v %#v", b.Config.Entrypoint, b.Config.Cmd, args, attributes)
> please remove
> 
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