NPE in oscm-portal when using the external parameter configurator

[opetrovski]

[Version] 16.1 Fix 5

[How to reproduce]

• create a marketable service with external parameter configurator
• subscribe to that service

[Expected result]

• the subscription is created and the service parameter values are stored in the bss and app databases

[Observed result]

• no error message
• the subscription is created
• the service parameter values are NOT set
• the system.log of the oscm domain contains a NPE

[Details] Java throws a NPE when the value for a switch statement is null. A solution is that the validator returns an empty string instead of null when the validation is successful. See SubscriptionWizardConversation.validateConfiguredParameters() Line 560

see attached system.log oscm-system-log.txt