Description of problem:
If the project-type for a version is not set, but the containing project's project-type is set, the .po download links on the documents page behave as though no project-type is set at all, but links should be available if there is a project type on the parent project.


Version-Release number of selected component (if applicable):
2.3

How reproducible:
Always

Steps to Reproduce:
1. Find a version that does not have project-type set, in a project that does have project-type set
2. Open the documents page for any locale
  
Actual results:
.po links are not enabled, and have a tooltip saying that the project type is not set.

Expected results:
.po links behave as though the project type for the version is the same as that of the parent project.

Additional info: