fzy: empty output if no valid selection

necessary if not this issue leads to change in upstream `fzy`:
jhawthorn/fzy#105

.shrc.d/80aude.sh

@@ -106,7 +106,7 @@ function print_files() {
 function choose() {
  # check for actual binaries, aliases and stuff won't work without
  if /usr/bin/which fzy >/dev/null 2>&1; then
- fzy
+ fzy | exists | is_not_empty
  elif /usr/bin/which fzf >/dev/null 2>&1; then
  fzf --cycle
  else
@@ -118,6 +118,24 @@ function choose() {
 function select_file() {
  print_files 2>/dev/null | choose
 }
+# helper functions
+function exists() {
+ while read -r file; do
+ if [ -e "$file" ]; then
+ printf '%s\n' "$file"
+ fi
+ done
+}
+function is_not_empty() {
+ empty='true'
+ while read -r line; do
+ printf '%s\n' "$line"
+ empty='false'
+ done
+ if "$empty"; then
+ return 1
+ fi
+}
 
 # if BASH
 if [[ -n $BASH_VERSION ]]; then