fix #245 again

nimbus/vm/computation.nim

@@ -113,8 +113,6 @@ proc applyMessageAux(computation: var BaseComputation, opCode: static[Op]) =
   if computation.msg.depth > STACK_DEPTH_LIMIT:
     raise newException(StackDepthError, "Stack depth limit reached")
 
-  let nilai = computation.vmState.readOnlyStateDb().getBalance(computation.msg.sender)
-
   if computation.msg.value != 0:
     let senderBalance =
       computation.vmState.readOnlyStateDb().

nimbus/vm/interpreter_dispatch.nim

@@ -228,7 +228,8 @@ proc opTableToCaseStmt(opTable: array[Op, NimNode], computation: NimNode): NimNo
 
   # Wrap the case statement in while true + computed goto
   result = quote do:
-    `computation`.prepareTracer()
+    if `computation`.tracingEnabled:
+      `computation`.prepareTracer()
     var `instr` = `computation`.code.next()
     while true:
       {.computedGoto.}