Assignment to entry in nil map error when shell to default container

[Shaokun-X]

Describe the bug
When I tried to shell connect to the default container of a pod, that is, on the Pods page pressing "S", the program crashed. This seems new after upgrading to v3.20.0.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Pods' page
2. Select a pod that has multiple containers (singular container works fine)
3. Press on 'S'
4. See error

Historical Documents
Error log:

ERR Boom! assignment to entry in nil map
ERR goroutine 1 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:24 +0x5e
github.com/derailed/k9s/cmd.run.func2()
	github.com/derailed/k9s/cmd/root.go:97 +0xb1
panic({0x10ff6c580?, 0x1104c7f10?})
	runtime/panic.go:770 +0x132
github.com/derailed/tview.(*Application).Run.func1()
	github.com/derailed/tview@v0.8.3/application.go:243 +0x45
panic({0x10ff6c580?, 0x1104c7f10?})
	runtime/panic.go:770 +0x132
github.com/derailed/k9s/internal/ui.(*KeyActions).Add(0xc0080d5d48, 0x1b, {{0x10eeca7fe, 0x4}, 0xc0080f8690, {0x1, 0x0, 0x0, 0x0, 0x0}})
	github.com/derailed/k9s/internal/ui/action.go:127 +0x85
github.com/derailed/k9s/internal/view.(*Picker).Init(0xc0080d5d40, {0x1105064e8?, 0xc0080d5e00?})
	github.com/derailed/k9s/internal/view/picker.go:41 +0x177
github.com/derailed/k9s/internal/view.(*App).inject(0xc000efc000, {0x1105271c0, 0xc0080d5d40}, 0x0)
	github.com/derailed/k9s/internal/view/app.go:717 +0x77
github.com/derailed/k9s/internal/view.containerShellin(0xc000efc000, {0x110527268, 0xc001f13610}, {0xc006d00780, 0x27}, {0x0?, 0x1000000000018?})
	github.com/derailed/k9s/internal/view/pod.go:393 +0x3e5
github.com/derailed/k9s/internal/view.(*Pod).shellCmd(0xc001f13610, 0xc000018bc0)
	github.com/derailed/k9s/internal/view/pod.go:252 +0xc8
github.com/derailed/k9s/internal/view.(*Table).keyboard(0xc003be6700, 0xc000018bc0)
	github.com/derailed/k9s/internal/view/table.go:97 +0x129
github.com/derailed/k9s/internal/view.(*Browser).InputHandler.(*Table).InputHandler.(*Box).WrapInputHandler.func2(0x10c3596e5?, 0xc0049d0360)
	github.com/derailed/tview@v0.8.3/box.go:179 +0x37
github.com/derailed/k9s/internal/view.(*PageStack).InputHandler.(*Pages).InputHandler.func1(0xc000018bc0, 0xc0049d0360)
	github.com/derailed/tview@v0.8.3/pages.go:332 +0xa2
github.com/derailed/k9s/internal/view.(*PageStack).InputHandler.(*Pages).InputHandler.(*Box).WrapInputHandler.func2(0xc002d6f7d0?, 0x10c3596e5?)
	github.com/derailed/tview@v0.8.3/box.go:182 +0x50
github.com/derailed/tview.(*Flex).InputHandler.func1(0xc000018bc0, 0xc0049d0360)
	github.com/derailed/tview@v0.8.3/flex.go:261 +0xd7
github.com/derailed/tview.(*Flex).InputHandler.(*Box).WrapInputHandler.func2(0xc000bb98c0?, 0xc0012de008?)
	github.com/derailed/tview@v0.8.3/box.go:182 +0x50
github.com/derailed/k9s/internal/ui.(*Pages).InputHandler.(*Pages).InputHandler.func1(0xc000018bc0, 0xc0049d0360)
	github.com/derailed/tview@v0.8.3/pages.go:332 +0xa2
github.com/derailed/k9s/internal/ui.(*Pages).InputHandler.(*Pages).InputHandler.(*Box).WrapInputHandler.func2(0xc002d6f948?, 0xc002d6f8b0?)
	github.com/derailed/tview@v0.8.3/box.go:182 +0x50
github.com/derailed/tview.(*Application).Run(0xc00024bdc0)
	github.com/derailed/tview@v0.8.3/application.go:334 +0x518
github.com/derailed/k9s/internal/view.(*App).Run(0xc000efc000)
	github.com/derailed/k9s/internal/view/app.go:551 +0x8f
github.com/derailed/k9s/cmd.run(0xc000dabd00?, {0x10eeca726?, 0x4?, 0x10eeca63a?})
	github.com/derailed/k9s/cmd/root.go:115 +0x3a5
github.com/spf13/cobra.(*Command).execute(0x1122a2260, {0xc000052180, 0x0, 0x0})
	github.com/spf13/cobra@v1.8.0/command.go:983 +0xaca
github.com/spf13/cobra.(*Command).ExecuteC(0x1122a2260)
	github.com/spf13/cobra@v1.8.0/command.go:1115 +0x3ff
github.com/spf13/cobra.(*Command).Execute(...)
	github.com/spf13/cobra@v1.8.0/command.go:1039
github.com/derailed/k9s/cmd.Execute()
	github.com/derailed/k9s/cmd/root.go:70 +0x1a
main.main()
	github.com/derailed/k9s/main.go:32 +0xf

Expected behavior
k9s selects the default container and establish a shell to it.

Screenshots
Not applicable

Versions (please complete the following information):

• OS: macOS 14.3.1 23D60 x86_64
• K9s: v0.32.0
• K8s: v1.26.12-eks-5e0fdde

Additional context
If I remember correctly, in 3.19.x or before versions there was no such bug.

[lightme16]

Same for me, just installed k9s via a brew and got this errors while trying to enter shell.

Version: v0.32.0
Commit: 0d16531
Date: 2024-03-02T17:20:41Z