NPE is thrown from Filter inside of frame on new window initialization

[jreznot]

Environment

• Platform version: 6.10.6
• Client type: Web

Description of the bug or enhancement

• Minimal reproducible example

1. Run demo application error-frame.zip
2. Login
3. Click on New window button in main screen

• Actual behavior

Exception is thrown:

17:07:40.592 ERROR c.h.c.g.c.filter.FilterDelegateImpl     - Exception on loading default filter '<new filter>'
java.lang.NullPointerException: null
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl.updateWindowCaption(FilterDelegateImpl.java:2120) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl.setFilterEntity(FilterDelegateImpl.java:613) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.components.filter.FilterDelegateImpl.loadFiltersAndApplyDefault(FilterDelegateImpl.java:498) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.web.gui.components.WebFilter.loadFiltersAndApplyDefault(WebFilter.java:87) [cuba-web-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.FilterLoader.lambda$loadComponent$1(FilterLoader.java:115) [cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext$TaskExecutor.run(ComponentLoaderContext.java:222) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext$TaskExecutor.run(ComponentLoaderContext.java:224) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext.executePostInitTasks(ComponentLoaderContext.java:126) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.FrameLoader$FrameLoaderPostInitTask.execute(FrameLoader.java:304) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext$TaskExecutor.run(ComponentLoaderContext.java:222) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext$TaskExecutor.run(ComponentLoaderContext.java:224) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext$TaskExecutor.run(ComponentLoaderContext.java:224) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.xml.layout.loaders.ComponentLoaderContext.executePostInitTasks(ComponentLoaderContext.java:126) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.gui.WindowManager.createWindow(WindowManager.java:584) ~[cuba-gui-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.web.WebWindowManager.createTopLevelWindow(WebWindowManager.java:1657) ~[cuba-web-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.web.App.createTopLevelWindow(App.java:298) ~[cuba-web-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.web.AppUI.setupUI(AppUI.java:300) ~[cuba-web-6.10.6.jar:6.10.6]
	at com.haulmont.cuba.web.AppUI.init(AppUI.java:222) ~[cuba-web-6.10.6.jar:6.10.6]
	at com.vaadin.ui.UI.doInit(UI.java:693) ~[vaadin-server-7.7.15.cuba.3.jar:7.7.15.cuba.3]

See also discussion https://www.cuba-platform.ru/discuss/t/oshibka-pri-otkrytii-prilozheniya-v-novom-okne-po-knopke-novoe-okno/2794/4

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How to test

1. Check above-menationed steps.
2. Try to edit, save, reset and other actions with Filter and make sure there is no exceptions.