Hotfix: don't crash on web3 provider errors during initialization

beacon_chain/eth1_monitor.nim

@@ -416,6 +416,7 @@ proc init*(T: type Eth1Monitor,
   var web3Url = web3Url
   fixupWeb3Urls web3Url
 
+  try:
     let dataProviderRes = await Web3DataProvider.new(depositContractAddress, web3Url)
     if dataProviderRes.isErr:
       return err(dataProviderRes.error)
@@ -441,6 +442,8 @@ proc init*(T: type Eth1Monitor,
       depositContractDeployedAt: depositContractDeployedAt,
       dataProvider: dataProvider,
       eth1Progress: newAsyncEvent())
+  except CatchableError as err:
+    return err("Failed to initialize the Eth1 monitor")
 
 proc allDepositsUpTo(m: Eth1Monitor, totalDeposits: uint64): seq[DepositData] =
   for i in 0'u64 ..< totalDeposits: