Can't reserve when $showInterviewer is FALSE (ie, not an administrator)

[ken]

An issue on 4.5.0. I can't reproduce this on the Demo as I can't change the permissions of the user.

Steps.

• (Assumes a survey has been set up)
• Set user to have permission to Reserve respondents for Campaign, but not administer campaigns
• Go to Campaigns > Reserve Respondents
• Do a search that returns a list of reservable contacts
• Select one and select the action Reserve
• The system gives an error "Missing Interviewer contact"

I can fix this by visiting CRM/Campaign/BAO/Query.php [line: 208] and preventing $showInterviewer from taking on the value FALSE (ie, always set it to be TRUE).