Add AssetUnavailable error

packages/asset-buyer/src/asset_buyer.ts

@@ -160,6 +160,9 @@ export class AssetBuyer {
             this._getOrdersAndFillableAmountsAsync(zrxTokenAssetData, shouldForceOrderRefresh),
             shouldForceOrderRefresh,
         ]);
+        if (ordersAndFillableAmounts.orders.length === 0) {
+            throw new Error(`${AssetBuyerError.AssetUnavailable}: For assetData ${assetData}`);
+        }
         const buyQuote = buyQuoteCalculator.calculate(
             ordersAndFillableAmounts,
             feeOrdersAndFillableAmounts,

packages/asset-buyer/src/types.ts

@@ -96,13 +96,7 @@ export enum AssetBuyerError {
     InsufficientZrxLiquidity = 'INSUFFICIENT_ZRX_LIQUIDITY',
     NoAddressAvailable = 'NO_ADDRESS_AVAILABLE',
     InvalidOrderProviderResponse = 'INVALID_ORDER_PROVIDER_RESPONSE',
-}
-
-/**
- * Possible errors thrown by an AssetBuyerManager instance or associated static methods.
- */
-export enum AssetBuyerManagerError {
-    AssetBuyerNotFound = 'ASSET_BUYER_NOT_FOUND',
+    AssetUnavailable = 'ASSET_UNAVAILABLE',
 }
 
 export interface OrdersAndFillableAmounts {