export loses error

[gregrwm]

  $ export vim=$HOME/.GVim-v8.2.2451.glibc2.15-x86_64.AppImage
  $
  $ vimV=$($vim --version)||echo handle error here              #without
export, error is captured
fuse: failed to exec fusermount: No such file or directory
open dir error: No such file or directory
handle error here
  $
  $ export vimV=$($vim --version)||echo handle error here       #with
export, error is lost
fuse: failed to exec fusermount: No such file or directory
open dir error: No such file or directory
  $