getting TypeError: Cannot read properties of undefined (reading 'type')

[imkrrish]

Describe the bug
getting TypeError: Cannot read properties of undefined (reading 'type')

To Reproduce

1. set trailingBlock: false
2. now add any of image, audio, video, file at the last block from slash menu then getting this error in console.

[nikkimontoya]

I ran into the same problem just randomly clicking in the editor with some text in it. It crashes here.

Apparently, the problem is in this expression e.getSelection()?.blocks || [e.getTextCursorPosition().block] in useSelectedBlocks. I guess, of e.getSelection()?.blocks returns an empty array, we need to take [e.getTextCursorPosition().block], but in current implementation we won't since [] == true.

Or maybe we just need to check if block is undefined