Opening Sequencer from "Window" toolbar option opens an empty window

After enabling the Sequencer plugin, opening Sequencer from the Window toolbar option brings up an empty window that cannot be interacted with.

Is this a regression:
No - Issue occurred in 4.10.4 as well

1. Open UE4 Editor
2. Navigate to Edit->Plugins->Editor
3. Enable Level Sequence Editor and restart project
4. After project restarts, navigate to Window->Sequencer

Result:
Window that opens has no options and cannot be interacted with

Expected:
User is prompted to create a new sequence or select one if one exists.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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