Error on editing a process variable with Entity type in the process instance editor

[gorbunkov]

Jmix: 1.5.2

1. Create a process with input dialog process form on the start
2. Add some property with "entity" type to the start form
3. Run the process
4. Open the process instance editor
5. Try to edit the entity process variable

AR: the exception:

Caused by: java.lang.IllegalArgumentException: MetaClass not found for null
	at io.jmix.core.metamodel.model.impl.SessionImpl.getClass(SessionImpl.java:43) ~[jmix-core-1.5.2.jar:na]
	at io.jmix.core.impl.MetadataImpl.getClass(MetadataImpl.java:129) ~[jmix-core-1.5.2.jar:na]
	at io.jmix.bpmui.screen.processvariable.VariableInstanceDataEdit.createEntityPickerField(VariableInstanceDataEdit.java:237) ~[jmix-bpm-ui-1.5.2.jar:na]
	at io.jmix.bpmui.screen.processvariable.VariableInstanceDataEdit.createComponent(VariableInstanceDataEdit.java:183) ~[jmix-bpm-ui-1.5.2.jar:na]
	at io.jmix.bpmui.screen.processvariable.VariableInstanceDataEdit.initValueComponent(VariableInstanceDataEdit.java:117) ~[jmix-bpm-ui-1.5.2.jar:na]
	at io.jmix.bpmui.screen.processvariable.VariableInstanceDataEdit.onBeforeShow(VariableInstanceDataEdit.java:77) ~[jmix-bpm-ui-1.5.2.jar:na]
	at io.jmix.core.common.event.EventHub.publish(EventHub.java:170) ~[jmix-core-1.5.2.jar:na]
	at io.jmix.ui.screen.Screen.fireEvent(Screen.java:124) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.screen.UiControllerUtils.fireEvent(UiControllerUtils.java:58) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.sys.ScreensImpl.fireScreenBeforeShowEvent(ScreensImpl.java:1364) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.sys.ScreensImpl.show(ScreensImpl.java:357) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.screen.Screen.show(Screen.java:306) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.bpmui.screen.processinstance.ProcessInstanceEditRuntimeFragment.onVariablesTableEdit(ProcessInstanceEditRuntimeFragment.java:261) ~[jmix-bpm-ui-1.5.2.jar:na]

See forum topic

Sample project: entity-variable-edit.zip

Additionally we need to test this in FlowUI screens.

[konyashkina]

Tested on
Jmix version: 1.5.999-SNAPSHOT
Jmix Studio plugin version: 1.5.SNAPSHOT5208-223
IntelliJ version: IntelliJ IDEA 2022.3.3 (Ultimate Edition)