Failed to handle key j: Cannot read property 'substring' of undefined

[CharlieWJ]

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

VSCodeVim version: 1.22.1

Stack trace

TypeError: Failed to handle key `j`: Cannot read property 'substring' of undefined
    at _.display (/Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/src/cmd_line/commandLine.ts:402:89)
    at statusBarText (/Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/src/statusBar.ts:199:35)
    at Object.clear (/Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/src/statusBar.ts:105:17)
    at j.updateView (/Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/src/mode/modeHandler.ts:1579:15)
    at j.handleKeyAsAnAction (/Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/src/mode/modeHandler.ts:673:16)
    at process.handledAsAction (internal/process/task_queues.js:93:5)
    at j.text [as handleKeyEvent] (/Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/src/mode/modeHandler.ts:478:11)
    at /Users/charlie/.vscode/extensions/vscodevim.vim-1.22.1/extensionBase.ts:372:73

[J-Fields]

Duplicate of #7512