check size before checking transaction rules

lib/index/index_rules.ex

@@ -36,8 +36,10 @@ defmodule IndexRules do
     # Rule: For each OutputBase:
     # if BaseDelta > 0, then it must be inferior or equal to the sum of all preceding BaseDelta
     # Rule: The sum of all inputs in CommonBase must equal the sum of all outputs in CommonBase
+    if :ets.info(local_sindex)[:size] > 0 do
       commonBase =
         :ets.match(local_sindex, {:_, %{base: :"$1"}})
+        |> IO.inspect()
         |> Enum.map(fn [base] -> String.to_integer(base) end)
         |> Enum.min()
 
@@ -93,6 +95,9 @@ defmodule IndexRules do
       else
         false
       end
+    else
+      true
+    end
   end
 
   defp getTransactionDepth(local_sindex, txHash, local_depth) do
@@ -119,11 +124,15 @@ defmodule IndexRules do
   end
 
   defp checkMaxTransactionChainingDepth(local_sindex) do
+    if :ets.info(local_sindex)[:size] > 0 do
       :ets.match(local_sindex, {:_, %{tx: :"$1"}})
       |> Enum.map(fn [txHash] -> txHash end)
       |> Enum.uniq()
       |> Enum.map(fn txHash -> getTransactionDepth(local_sindex, txHash, 0) end)
       |> Enum.max() <= 5
+    else
+      true
+    end
   end
 
   def check(local_iindex, local_mindex, local_cindex, local_sindex) do