even more graceful pricing

tokens/usecase/tokens_usecase.go

@@ -213,15 +213,18 @@ func (t *tokensUseCase) GetPrices(ctx context.Context, baseDenoms []string, quot
 // Returns error if base denom is not found in the token metadata.
 // Sets the price to zero in case of failing to compute the price between base and quote but these being valid tokens.
 func (t *tokensUseCase) getPricesForBaseDenom(ctx context.Context, pricingStrategy domain.PricingStrategy, baseDenom string, quoteDenoms []string) (map[string]any, error) {
+
+	byQuoteDenomForGivenBaseResult := make(map[string]any, len(quoteDenoms))
 	// Validate base denom is a valid denom
-	// This will error if denom is unlisted.
+	// Return zeroes for all quotes if base denom is not found
 	_, err := t.GetMetadataByChainDenom(ctx, baseDenom)
 	if err != nil {
-		return nil, err
+		for _, quoteDenom := range quoteDenoms {
+			byQuoteDenomForGivenBaseResult[quoteDenom] = osmomath.ZeroBigDec()
+		}
+		return byQuoteDenomForGivenBaseResult, err
 	}
 
-	byQuoteDenomForGivenBaseResult := make(map[string]any, len(quoteDenoms))
-
 	// Create a channel to communicate the results
 	resultsChan := make(chan priceResult, len(quoteDenoms))