This commit fixes a small bug where the macOS native titlebar file path
icon (often referred to as proxy icon) wouldn't be cleared when creating
a new blank file and would instead retain its previous state. This was
caused by the GHOST setPath() function being short-circuited by the
&& operator, since `has_filepath` was false. The GHOST WindowCocoa
setPath() function was also simplified to remove unneeded exception
handling.
Pull Request: https://projects.blender.org/blender/blender/pulls/132359
b99497bf21