NullReferenceException in PIP

[andreasisnes]

Description of the bug

In pip when looking up a party, there's not an if statement that checks if the result is null, resulting in an NullReferenceException is throw is we try reference specific fields in party object.

Last 7 days yielded 20 exceptions.

Fix: Check if result is null and return empty list.

https://portal.azure.com/#view/AppInsightsExtension/DetailsV2Blade/ComponentId~/%7B%22SubscriptionId%22%3A%221ab2d164-1861-4ff8-be8c-069c3ee3b70a%22%2C%22ResourceGroup%22%3A%22altinnplatform-prod-rg%22%2C%22Name%22%3A%22prod-platform-ai%22%2C%22LinkedApplicationType%22%3A0%2C%22ResourceId%22%3A%22%252Fsubscriptions%252F1ab2d164-1861-4ff8-be8c-069c3ee3b70a%252FresourceGroups%252Faltinnplatform-prod-rg%252Fproviders%252Fmicrosoft.insights%252Fcomponents%252Fprod-platform-ai%22%2C%22ResourceType%22%3A%22microsoft.insights%252Fcomponents%22%2C%22IsAzureFirst%22%3Afalse%7D/DataModel~/%7B%22eventId%22%3A%2276ae36e2-65f7-11ef-b23b-6045bdeae9a6%22%2C%22timestamp%22%3A%222024-08-29T11%3A09%3A50.237Z%22%2C%22cacheId%22%3A%22208ced44-3cbb-47ca-ab8d-11bf52721581%22%2C%22eventTable%22%3A%22exceptions%22%7D