Fix numeric parsing error related to cash positions

apps/api/src/app/portfolio/calculator/portfolio-calculator.ts

@@ -433,9 +433,8 @@ export abstract class PortfolioCalculator {
         investment: totalInvestment,
         investmentWithCurrencyEffect: totalInvestmentWithCurrencyEffect,
         marketPrice:
-          marketSymbolMap[endDateString]?.[item.symbol]?.toNumber() ?? null,
-        marketPriceInBaseCurrency:
-          marketPriceInBaseCurrency?.toNumber() ?? null,
+          marketSymbolMap[endDateString]?.[item.symbol]?.toNumber() ?? 1,
+        marketPriceInBaseCurrency: marketPriceInBaseCurrency?.toNumber() ?? 1,
         netPerformance: !hasErrors ? (netPerformance ?? null) : null,
         netPerformancePercentage: !hasErrors
           ? (netPerformancePercentage ?? null)

apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-cash.spec.ts

@@ -247,7 +247,7 @@ describe('PortfolioCalculator', () => {
         includeInTotalAssetValue: false,
         investment: new Big(1820),
         investmentWithCurrencyEffect: new Big(1750),
-        marketPrice: null,
+        marketPrice: 1,
         marketPriceInBaseCurrency: 0.91,
         netPerformance: new Big(0),
         netPerformancePercentage: new Big(0),

apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-valuable.spec.ts

@@ -129,7 +129,7 @@ describe('PortfolioCalculator', () => {
             grossPerformanceWithCurrencyEffect: new Big('0'),
             investment: new Big('500000'),
             investmentWithCurrencyEffect: new Big('500000'),
-            marketPrice: null,
+            marketPrice: 1,
             marketPriceInBaseCurrency: 500000,
             netPerformance: new Big('0'),
             netPerformancePercentage: new Big('0'),