fix when browse into empty directory

sfm

@@ -1,6 +1,5 @@
 #!/bin/sh
-# sfm - Simple File Manager in POSIX sh (flicker-free)
-# version 0.3
+# sfm - Simple File Manager in POSIX sh
 
 # --- terminal control ---
 tput_cmd() { command -v tput >/dev/null 2>&1 && tput "$@"; }
@@ -443,7 +442,7 @@ draw_topbar() {
 draw_botbar() {
     _rows=$1; _cols=$2
     if [ "$SEARCHING" = "1" ]; then
-        info=" $((SEL + 1))/${COUNT} ${CWD}"
+        info=" $([ "$COUNT" -eq 0 ] && echo 0 || echo $((SEL + 1)))/${COUNT} ${CWD}"
         keys=" search: ${FILTER} "
         maxk=$((_cols - ${#info} - 1))
         [ "${#keys}" -gt "$maxk" ] && keys=$(printf '%s' "$keys" | cut -c1-"$maxk")
@@ -457,9 +456,8 @@ draw_botbar() {
             "${YELLOW}${keys}" \
             "${RESET}"
     elif [ -n "$INFO_MSG" ]; then
-        info=" $((SEL + 1))/${COUNT} ${CWD}"
-        msg=" ${INFO_MSG} "
-        padlen=$((_cols - ${#info} - ${#msg}))
+        info=" $([ "$COUNT" -eq 0 ] && echo 0 || echo $((SEL + 1)))/${COUNT} ${CWD}"
+        msg=" ${INFO_MSG} "        padlen=$((_cols - ${#info} - ${#msg}))
         [ "$padlen" -lt 0 ] && padlen=0
         pad=$(printf '%*s' "$padlen" '')
         goto "$_rows" 1
@@ -478,7 +476,7 @@ draw_botbar() {
         [ "$SORT_MODE" != "name" ] && _ind="${_ind} [sort:${SORT_MODE}]"
         [ "$SHOW_DETAILS" = "1" ]  && _ind="${_ind} [details]"
         hint="  press ? for help "
-        info=" $((SEL + 1))/${COUNT} ${CWD}${_ind}"
+        info=" $([ "$COUNT" -eq 0 ] && echo 0 || echo $((SEL + 1)))/${COUNT} ${CWD}${_ind}"
         padlen=$((_cols - ${#info} - ${#hint}))
         [ "$padlen" -lt 0 ] && padlen=0
         pad=$(printf '%*s' "$padlen" '')
@@ -523,6 +521,12 @@ draw() {
             row=$((row + 1))
             idx=$((idx + 1))
         done
+        # show (empty) if directory has no entries
+        if [ "$COUNT" -eq 0 ]; then
+            goto 2 1
+            printf '%s  (empty)%s%s' "${WHITE}" "${ERASE_LINE}" "${RESET}"
+            row=3
+        fi
         # blank leftover rows (e.g. after entering a smaller directory)
         while [ "$row" -le $((LIST_ROWS + 1)) ]; do
             goto "$row" 1