fix: remove oil order crash

requestCount is not allowed to be zero.
This commit returns early if the amount needed is less than 100.

biofuel-manager.lua

@@ -21,6 +21,7 @@ local BIOFUEL_PKG = "Biofuel"
 local order = {
     oil = function (amt, ticker)
         local orderCount = math.floor(amt / 100)
+        if orderCount < 1 then return end
         local request = {
             tags = {
                 ["c:seeds"] = true,