Changes : Throws Null Pointer Exception on creating Change with duplicate name with empty status

Current Situation: 
On creating new Change with duplicate name with empty status, throws Null Pointer Exception.

Steps to reproduce:

• In the env click on upper right corner settings icon -> Manage changes -> Add change
• Create a change with the name same as an existing change.
• Leave the status field empty -> produce below error :
  • java.lang.NullPointerException: Cannot invoke "com.sos.joc.model.inventory.changes.common.ChangeState.intValue()" because the return value of "com.sos.joc.model.inventory.changes.common.ChangeIdentifier.getState()" is null

Desired Behavior

On creating new Change with duplicate name with empty status, should not throw any Exception.