Fix: Potential NRE on app close

Dirkster99 / AvalonDock

Our own development branch of the well known WPF document docking library

Microsoft Public License

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Fix: Potential NRE on app close #425

Closed Khaos66 closed 1 year ago

Khaos66 commented 1 year ago

When calling Clear on the collection that holds the documents on app close, I got a NRE from DockingManager.DocumentsSourceElementsChanged. This fixes this issue

Khaos66 commented 1 year ago

Sorry I messed up the upstream merge. Does it matter?