more pure bash to speed up things

dabo/functions/get_vars_from_csv.sh

@@ -12,6 +12,8 @@ function get_vars_from_csv {
     mapfile -t f_last_lines_array <<< $(tail -n4 "${f_ASSET_HIST_FILE}")
   fi
 
+  [ -z "${f_last_lines_array[0]}" ] && return 1
+
   if [ -z "${f_market_performance}" ]
   then
     f_market_performance="-50"