Feature/add fallback for loading currencies (#315)

* Add fallback for loading currencies

* Update changelog

apps/api/src/services/exchange-rate-data.service.ts

@@ -3,7 +3,7 @@ import { DATE_FORMAT, getYesterday } from '@ghostfolio/common/helper';
 import { Injectable } from '@nestjs/common';
 import { Currency } from '@prisma/client';
 import { format } from 'date-fns';
-import { isNumber } from 'lodash';
+import { isEmpty, isNumber } from 'lodash';
 
 import { DataProviderService } from './data-provider/data-provider.service';
 
@@ -35,6 +35,24 @@ export class ExchangeRateDataService {
       getYesterday()
     );
 
+    if (isEmpty(result)) {
+      // Load currencies directly from data provider as a fallback
+      // if historical data is not yet available
+      const historicalData = await this.dataProviderService.get(
+        this.currencyPairs.map((currencyPair) => {
+          return currencyPair;
+        })
+      );
+
+      Object.keys(historicalData).forEach((key) => {
+        result[key] = {
+          [format(getYesterday(), DATE_FORMAT)]: {
+            marketPrice: historicalData[key].marketPrice
+          }
+        };
+      });
+    }
+
     const resultExtended = result;
 
     Object.keys(result).forEach((pair) => {