Check named pipe existence for preventing "No such file ro directory"…

… error

bashcached

@@ -51,7 +51,7 @@ else
  trap 'rm -f "$BASHCACHED_PIPE"' EXIT
  (( ${check-60} != 0 )) && while echo; do sleep "${check-60}"; done >"$BASHCACHED_PIPE" &
 
- while true; do cat "$BASHCACHED_PIPE"; done | while read -r line; do
+ while [[ -p "$BASHCACHED_PIPE" ]]; do cat "$BASHCACHED_PIPE" 2>/dev/null; done | while read -r line; do
  cmd='' recv='' send=; eval "$line"; read -ra cmd<<<"$cmd"; time=$(printf '%(%s)T' -1)
  (( time - before >= ${check-60} )) && for k in "${!exptime[@]}"; do
  ! cache_has $k && cache_delete $k; done && before=$time