Fix block handler for multichain

Author: DZakh

codegenerator/cli/npm/envio/src/Batch.res

@@ -58,6 +58,18 @@ let getOrderedNextItem = (fetchStates: ChainMap.t<FetchState.t>): option<
   })
 }
 
+let hasUnorderedNextItem = (fetchStates: ChainMap.t<FetchState.t>) => {
+  fetchStates
+  ->ChainMap.values
+  ->Js.Array2.some(fetchState => {
+    fetchState->FetchState.isActivelyIndexing &&
+      switch fetchState->FetchState.getEarliestEvent {
+      | Item(_) => true
+      | NoItem(_) => false
+      }
+  })
+}
+
 let popOrderedBatchItems = (
   ~maxBatchSize,
   ~fetchStates: ChainMap.t<FetchState.t>,

codegenerator/cli/templates/static/codegen/src/eventFetching/ChainManager.res

@@ -102,7 +102,10 @@ Simply calls getOrderedNextItem in isolation using the chain manager without
 the context of a batch
 */
 let nextItemIsNone = (chainManager: t): bool => {
-  chainManager->getFetchStateWithData->Batch.getOrderedNextItem === None
+  switch chainManager.multichain {
+  | Ordered => chainManager->getFetchStateWithData->Batch.getOrderedNextItem === None
+  | Unordered => chainManager->getFetchStateWithData->Batch.hasUnorderedNextItem
+  }
 }
 
 let createBatch = (chainManager: t, ~maxBatchSize: int): Batch.t => {