Error 500 when browsing project files

Created by: rtripault

On some projects, the following error is raised when browsing files : ActionView::Template::Error (undefined methodcommitted_date' for nil:NilClass):`

The "pattern" seems to occur on "old" projects. Did i miss some task to perform ? Thanks

Gitlab 5.1, 248b2554

System information
System:     Debian 6.0.7
Current User:   git
Using RVM:  no
Ruby Version:   1.9.3p392
Gem Version:    2.0.3
Bundler Version:1.3.5
Rake Version:   10.0.4