NPE when trying to create filter with the paramWhere clause

[natfirst]

Environment

• Platform version: 7.0.1
• Forum issue
  https://www.cuba-platform.ru/discuss/t/versiya-7-dobavlenie-custom-condition-s-paramwhere/2740
  https://www.cuba-platform.com/discuss/t/use-component-filter-in-7-0-got-nullpointerexception/8676

Description of the bug or enhancement

1. Create to entities (OilField and Country)

2. Add MANY_TO_ONE association between OilField and Country

3. Create screens for these entities, run the app

4. In OilField browser add Country to the filter condition

5. In filter edit screen add custom condition, that depends on the previous condition
   

6. Try to save the filter

java.lang.NullPointerException
	at com.haulmont.cuba.gui.data.impl.AbstractCollectionDatasource.getQueryParameters(AbstractCollectionDatasource.java:259)
	at com.haulmont.cuba.gui.data.impl.AbstractCollectionDatasource.createDataQuery(AbstractCollectionDatasource.java:508)
	at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.beforeLoadData(CollectionDatasourceImpl.java:635)
	at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.loadData(CollectionDatasourceImpl.java:609)
	at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.refresh(CollectionDatasourceImpl.java:161)
	at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.refresh(CollectionDatasourceImpl.java:119)
	at com.haulmont.cuba.gui.components.filter.Param.createOptionsDataSource(Param.java:927)
	at com.haulmont.cuba.gui.components.filter.Param.createEntityLookup(Param.java:877)
	at com.haulmont.cuba.gui.components.filter.Param.createEditComponent(Param.java:567)
	at com.haulmont.cuba.gui.components.filter.ParamEditor.createParamEditLayout(ParamEditor.java:77)
	at com.haulmont.cuba.gui.components.filter.ParamEditor.<init>(ParamEditor.java:65)
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl.createParamEditor(FilterDelegateImpl.java:993)
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl.recursivelyCreateConditionsLayout(FilterDelegateImpl.java:885)
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl.fillConditionsLayout(FilterDelegateImpl.java:836)
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl$EditAction.lambda$actionPerform$0(FilterDelegateImpl.java:2407)
	at com.haulmont.cuba.gui.components.compatibility.AfterCloseListenerAdapter.accept(AfterCloseListenerAdapter.java:58)
	at com.haulmont.cuba.gui.components.compatibility.AfterCloseListenerAdapter.accept(AfterCloseListenerAdapter.java:26)
	at com.haulmont.bali.events.EventHub.publish(EventHub.java:170)
	at com.haulmont.cuba.gui.screen.Screen.fireEvent(Screen.java:128)
	at com.haulmont.cuba.gui.screen.Screen.close(Screen.java:343)
	at com.haulmont.cuba.gui.components.Window.close(Window.java:258)
	at com.haulmont.cuba.gui.components.filter.edit.FilterEditor.commitAndClose(FilterEditor.java:350)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.haulmont.cuba.gui.xml.DeclarativeAction.actionPerform(DeclarativeAction.java:96)
	at com.haulmont.cuba.web.gui.components.WebButton.buttonClicked(WebButton.java:62)