Error on custom keybinding

[Sander-Zeeman]

Description of the problem or steps to reproduce

Hello!

I was messing around with custom keybindings inside Micro and ran into a runtime error.
In the end, the action I tried to bind was completely unnecessary, but I thought I'd do my part and report it anyway!

When I bound the following action inside micro/bindings.json:
"Ctrl-b": "command:term clear,command:term"
The following error + stack trace appears

Micro encountered an error: runtime.errorString runtime error: invalid memory address or nil pointer dereference
runtime/panic.go:199 (0x55b9a0075b40)
runtime/panic.go:198 (0x55b9a007597d)
github.com/zyedidia/micro/internal/action/command.go:808 (0x55b9a05bc789)
github.com/zyedidia/micro/internal/action/command.go:891 (0x55b9a05bcef7)
github.com/zyedidia/micro/internal/action/command.go:94 (0x55b9a05c4bf0)
github.com/zyedidia/micro/internal/action/bufpane.go:394 (0x55b9a05b4c38)
github.com/zyedidia/micro/internal/action/bufpane.go:122 (0x55b9a05c4844)
github.com/zyedidia/micro/internal/action/bufpane.go:381 (0x55b9a05b4910)
github.com/zyedidia/micro/internal/action/bufpane.go:308 (0x55b9a05b4864)
github.com/zyedidia/micro/internal/action/tab.go:246 (0x55b9a05c1fbe)
github.com/zyedidia/micro/internal/action/tab.go:136 (0x55b9a05c17be)
github.com/zyedidia/micro/cmd/micro/micro.go:343 (0x55b9a05e5132)
github.com/zyedidia/micro/cmd/micro/micro.go:297 (0x55b9a05e4ca8)
runtime/proc.go:203 (0x55b9a0062246)
runtime/asm_amd64.s:1357 (0x55b9a008e551)

If you can reproduce this error, please report it at https://github.com/zyedidia/micro/issues

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Specifications

Commit hash: 6998cb5
OS: Ubuntu-20.04 on WSLg, Windows 11
Terminal: I was unable to find which terminal WSL uses by default, but that's the one. My apologies for not being more specific, but I'm not yet very familiar with WSL.

I've really been enjoying using Micro, thank you very much for developing it!

-Sander