Remove check for file existence in channels.ssh.ssh.SSHChannel.pull_file() (fixes #1785) (#1800)
Remove check for file existence in channels.ssh.ssh.SSHChannel.pull_file() (fixes #1785) (#1800)

Co-authored-by: Yadu Nand Babuji <d4d52b73e992a1e02c7e71afc690d71169073308@gmail.com>
Parsl/parsl,Parsl/parsl,Parsl/parsl,Parsl/parsl