R1:e9e2c954132c

Fix regression in PHUIObjectItemView.php:662: allow PhutilURI and other stringlike

Summary:
This fixes this specific exception that can happen with whatever PHP version in some pages:

Call to phutil_nonempty_string() expected null or a string, got: PhutilURI from PHUIObjectItemView.php:662

The regression was introduced since:

b56d86e48d0f63028cb5739c179d61ece2a24bb1

The problem is caused by the fact that we are trying to introduce very strict checks, and sometime we are too much strict.

In this…