Trying to import watch only wallet crashes the app

[joyceofoche]

Note: This issue happened on a fresh installation of cryptopower (with no previous wallets)

2023-10-13 15:49:05.686 [INF] DCR: Opened wallet
2023-10-13 15:49:05.695 [INF] SHWL: Created Watching Only Wallet
panic: assignment to entry in nil map

goroutine 551 [running]:
github.com/crypto-power/cryptopower/libwallet/assets/dcr.(*Asset).AddAccountMixerNotificationListener(0x14002a6c340, {0x1024369e0?, 0x1400277f000}, {0x101943021, 0x8})
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/libwallet/assets/dcr/account_mixer.go:36 +0xb8
github.com/crypto-power/cryptopower/ui/page/root.(*OverviewPage).listenForMixerNotifications(0x1400277f000)
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/ui/page/root/overview_page.go:999 +0x1b0
github.com/crypto-power/cryptopower/ui/page/root.(*OverviewPage).OnNavigatedTo(0x1400277f000)
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/ui/page/root/overview_page.go:198 +0x14c
github.com/crypto-power/cryptopower/app.(*PageStack).Push(0x14003008660, {0x102440160, 0x1400277f000}, {0x102443770, 0x14002f82070})
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/app/pagestack.go:67 +0x460
github.com/crypto-power/cryptopower/app.(*MasterPage).Display(0x14002f82070, {0x102440160?, 0x1400277f000?})
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/app/masterpage.go:46 +0x3c
github.com/crypto-power/cryptopower/ui/page/root.(*HomePage).OnNavigatedTo(0x14002e0e000)
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/ui/page/root/home_page.go:138 +0xec
github.com/crypto-power/cryptopower/app.(*PageStack).Push(0x14002b063f0, {0x10243f308, 0x14002e0e000}, {0x102443720, 0x14002b06420})
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/app/pagestack.go:67 +0x460
github.com/crypto-power/cryptopower/app.(*SimpleWindowNavigator).Display(0x14002b06420, {0x10243f308?, 0x14002e0e000?})
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/app/window.go:49 +0x3c
github.com/crypto-power/cryptopower/ui/page/root.(*CreateWallet).walletCreationSuccessCallback(0x14002a2a850?)
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/ui/page/root/wallet_setup_page.go:630 +0x54
github.com/crypto-power/cryptopower/ui/page/root.(*CreateWallet).HandleUserInteractions.func3()
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/ui/page/root/wallet_setup_page.go:551 +0x490
created by github.com/crypto-power/cryptopower/ui/page/root.(*CreateWallet).HandleUserInteractions in goroutine 70
	/Users/kennedy/go/src/github.com/crypto-power/cryptopower/ui/page/root/wallet_setup_page.go:514 +0x5e4
joyceofoche@Joyces-MacBook-Air ~ % ```