Fix exchange rate gathering job

- Handling for Subcurrencies if main currency does not have date (i.e. GBP on 08.10.2013 will fail when trying to convert to GBp)

apps/api/src/services/data-provider/data-provider.service.ts

@@ -690,7 +690,9 @@ export class DataProviderService {
 
     for (const date in rootData) {
       data[date] = {
-        marketPrice: new Big(factor).mul(rootData[date].marketPrice).toNumber()
+        marketPrice: rootData[date].marketPrice
+          ? new Big(factor).mul(rootData[date].marketPrice).toNumber()
+          : null
       };
     }