Fix state for 0x0 block (#412)

src/main/kotlin/io/emeraldpay/dshackle/upstream/RecursiveLowerBoundBlockDetector.kt

@@ -27,7 +27,7 @@ abstract class RecursiveLowerBoundBlockDetector(
                 } else {
                     val middle = middleBlock(data)
 
-                    if (data.left > data.right || middle == 0L) {
+                    if (data.left > data.right) {
                         val current = if (data.current == 0L) 1 else data.current
                         Mono.just(LowerBoundData(current, true))
                     } else {

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumLowerBoundBlockDetector.kt

@@ -40,6 +40,9 @@ class EthereumLowerBoundBlockDetector(
     }
 
     override fun hasState(blockNumber: Long): Mono<Boolean> {
+        if (blockNumber == 0L) {
+            return Mono.just(true)
+        }
         return upstream.getIngressReader().read(
             JsonRpcRequest(
                 "eth_getBalance",