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java.lang.NullPointerException: 	at jetbrains.mps.nodeEditor.cellActions.CellAction_DeleteNode.getSiblingToSelect(CellAction_DeleteNode.java:82)	at jetbrains.mps.nodeEditor.cellActions.CellAction_DeleteNode.execute(CellAction_DeleteNode.java:65)	at jetbrains.mps.nodeEditor.actions.ActionHandlerImpl$1.doExecute(ActionHandlerImpl.java:56)	at jetbrains.mps.editor.runtime.commands.EditorCommand.run(EditorCommand.java:52)	at jetbrains.mps.smodel.WorkbenchModelAccess$CommandRunnable$1.run(WorkbenchModelAccess.java:642)	at jetbrains.mps.smodel.WriteActionDispatcher.run(WriteActionDispatcher.java:39)	at jetbrains.mps.smodel.WorkbenchModelAccess$3.run(WorkbenchModelAccess.java:135)	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1010)	at jetbrains.mps.smodel.WorkbenchModelAccess.runWriteAction(WorkbenchModelAccess.java:144)	at jetbrains.mps.smodel.WorkbenchModelAccess$CommandRunnable.run(WorkbenchModelAccess.java:637)	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:124)	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:99)	at jetbrains.mps.smodel.WorkbenchModelAccess.runWriteActionInCommand(WorkbenchModelAccess.java:450)	at jetbrains.mps.smodel.WorkbenchModelAccess.executeCommand(WorkbenchModelAccess.java:413)	at jetbrains.mps.project.ProjectModelAccess.executeCommand(ProjectModelAccess.java:43)	at jetbrains.mps.nodeEditor.actions.ActionHandlerImpl.executeAction(ActionHandlerImpl.java:53)	at jetbrains.mps.nodeEditor.actions.ActionHandlerImpl.executeAction(ActionHandlerImpl.java:43)	at jetbrains.mps.nodeEditor.selection.EditorCellSelection.executeAction(EditorCellSelection.java:166)	at jetbrains.mps.nodeEditor.selection.EditorCellLabelSelection.performDeleteAction(EditorCellLabelSelection.java:200)	at jetbrains.mps.nodeEditor.selection.EditorCellLabelSelection.executeAction(EditorCellLabelSelection.java:165)	at jetbrains.mps.ide.editor.actions.Backspace_Action.doExecute(Backspace_Action.java:55)	at jetbrains.mps.workbench.action.BaseAction$2.run(BaseAction.java:145)	at jetbrains.mps.workbench.action.BaseAction.actionPerformed(BaseAction.java:155)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher$3.performAction(IdeKeyEventDispatcher.java:595)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction(IdeKeyEventDispatcher.java:646)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.inInitState(IdeKeyEventDispatcher.java:485)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.java:215)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:622)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:381)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)