Description of problem:
needinfo flag can't be set:

Version-Release number of selected component (if applicable):
3.6

How reproducible:
100%

Steps to Reproduce:
1. open a bug report
2. activate "Need additional information from" checkbox
3. select "anyone" in the from dropdown box (I have not tested whether other values would also cause the problem.)
  
Actual results:
"
Red Hat Bugzilla has suffered an internal error. Please save this page and send it to bugzilla-owner with details of what you were doing at the time this message appeared.

URL: https://bugzilla.redhat.com/process_bug.cgi
The function Bugzilla::Flag->set_flag requires a id/type_id argument, and that argument was not set. 
"

Expected results:
needinfo flag should be set appropriately