fix(sshfs): work around bash-4.3 nounset

Author: akinomyoga

completions/sshfs

@@ -8,9 +8,10 @@ _comp_cmd_sshfs()
     _comp_expand || return
 
     if [[ $cur == *:* ]]; then
-        _comp_compgen -x scp remote_files -d
-        # unlike scp and rsync, sshfs works with 1 backslash instead of 3
-        COMPREPLY=("${COMPREPLY[@]//\\\\\\/\\}")
+        if _comp_compgen -x scp remote_files -d; then
+            # unlike scp and rsync, sshfs works with 1 backslash instead of 3
+            COMPREPLY=("${COMPREPLY[@]//\\\\\\/\\}")
+        fi
         return
     fi