ObjectNotFoundException when creating a new project default protocol that is replacing an older protocol

[Nicklas Nordborg]

This is more or less the same problem as #1855 but a bit more complicated to reproduce.

1. Create a project and make it the active project
2. Create a protocol and add it as a default protocol to the project
3. Delete the protocol and clean the trashcan
4. Create a second protocol and add it as the default protocol to the project
5. Create a third protocol and replace the the existing default protocol. When saving you get an error message like the one below:

No row with the given identifier exists: [net.sf.basedb.core.data.ProtocolData#752318]
org.hibernate.ObjectNotFoundException
...at org.hibernate.internal.SessionFactoryImpl$1$1.handleEntityNotFound(SessionFactoryImpl.java:253)
...at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:262)
...at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:176)
...at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:286)
...at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
...at data.ProtocolData_$$_jvstf1_2.getItemSubtype(ProtocolData_$$_jvstf1_2.java)
...at Project.replaceDefaultItem(Project.java:696)

The ProtocolData#752318 is the id of the first protocol that was deleted.

Workaround is to go to the View -> Projects page and enter the current project. This will automatically remove the link to the non-existing item.

[Nicklas Nordborg]

(In [6761]) Fixes #1925: ObjectNotFoundException when creating a new project default protocol that is replacing an older protocol