caller might be undefined, avoid type error

[bit]

Uncaught TypeError: caller is undefined
callInfo TargetInfo.jsx:65
value TargetInfo.jsx:62
TargetInfo.jsx:65:20

[richardolsson]

I think you've found the same bug that I found when I deployed your recent changes earlier today. But it's odd because caller should never be undefined. And if the caller is undefined, fixing it just here won't be enough.

Have you been able to reproduce this locally, and found that this fix solves the problem without introducing any new problems?

It seems to me like this was happening because of some server-side error when loading the memberships of the current user, when that user has a very large number of memberships (such as a top-level admin). I verified that it wasn't happening for more normal users, such as non-admin callers or lower-level admins.

[bit]

I have never seen this error on the local test system, only in production and not right after the new deployment but once many people started calling tonight. So this might need be related to server side issues.