[machine] EthCfOpGenerator.update() shouldn't fail completely if no appID is provided

[joelalejandro]

monorepo/packages/machine/src/middleware/cf-operation/cf-op-generator.ts

Lines 61 to 71 in 1a20e08

	public update(
	message: InternalMessage,
	context: Context,
	cfState: CfState,
	proposedUpdate: any
	): CfOperation {
	const multisig: Address = message.clientMessage.multisigAddress;
	if (message.clientMessage.appId === undefined) {
	// FIXME: handle more gracefully
	throw Error("update message must have appId set");
	}