Recalculate button causes the Import Operations Tree to disappear

Affected Versions: 

Jira: 8.21
Project Configurator: 3.0.3

Description:  

Selecting 'Recalculate' after making changes to the Import Operations tree is cauing the Import Operations Tree to disappear from the screen.

Steps to reproduce 

• Import a project Configuration 
• Ensure 'First run a simulated configuration import'
• Make a change to the Import Operations Tree i.e deselect a filter
• Select 'Recalculate' 

Expected behaviour 

The Import simulation will run again and update the Import Operations Tree if required. 

Actual Behaviour

The Import Operations Tree is removed from the screen. 

Additional Information 

The following message was displayed in the logs:

2019-06-27 14:01:48,334 http-nio-8080-exec-18 WARN vrtareg 841x23480x1 u2bbjq 217.38.31.121,0:0:0:0:0:0:0:1 /rest/projectconfigurator/latest/importtree/recalculate [c.a.p.loaders.handlers.StatusHandler] Mapping proposed status name: 'In progress' to 'In Progress'