Restart & Run All does nothing if kernel hasn't been requested

[narrator0]

Describe the bug

If kernel hasn't been requested, Restart and Run All button will change output text to waiting for kernel... and hangs.

To Reproduce

Steps to reproduce the behavior:

1. Set kernel: false in configuration
2. Click on Restart and Run All

Expected behavior

Should request kernel first and then run all the cells.

Possible Fix

Removing the kernel check in here should fix the problem since kernel is checked in execute and will automatic request if not found.

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