solana: make block.height optional

Author: tmcgroul

solana/solana-normalization/src/data.ts

@@ -3,7 +3,7 @@ import type {Base58Bytes} from '@subsquid/solana-rpc-data'
 
 export interface BlockHeader {
     hash: Base58Bytes
-    height: number
+    height?: number
     slot: number
     parentSlot: number
     parentHash: Base58Bytes

solana/solana-normalization/src/mapping.ts

@@ -13,7 +13,7 @@ export {Journal}
 export function mapRpcBlock(slot: number, src: rpc.GetBlock, journal: Journal): Block {
     let header: BlockHeader = {
         hash: src.blockhash,
-        height: assertNotNull(src.blockHeight, '.blockHeight is not available'),
+        height: src.blockHeight ?? undefined,
         slot,
         parentSlot: src.parentSlot,
         parentHash: src.previousBlockhash,