fix(dep_graph): fix panic on selecting AUR providers

[Juneezee]

This commit fixes #2289 by making provideMenu returns the first option when it receives an error input from the user (e.g. user sends EOF).

How to validate

We can validate this fix by trying to install libmediawiki. This package has multiple AUR providers.

Before

Panic on EOF (Ctrl+D)

yay -S libmediawiki                                                                                                                                                 ✘ INT
:: There are 2 providers available for kcoreaddons:
:: Repository AUR
    1) kcoreaddons-git 2) kf5-transition-dummy 

Enter a number (default=1): 
==>  -> EOF
 -> runtime error: invalid memory address or nil pointer dereferencegoroutine 1 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:24 +0x5e
main.main.func2()
	github.com/Jguer/yay/v12/main.go:125 +0x45
panic({0x55862194a3e0?, 0x558621bf6680?})
	runtime/panic.go:914 +0x21f
github.com/Jguer/yay/v12/pkg/dep.(*Grapher).findDepsFromAUR(0xc000232140, {0x5586219b8c30, 0x558621c6f440}, {0x5586219bcc58, 0xc000279d10})
	github.com/Jguer/yay/v12/pkg/dep/dep_graph.go:556 +0x8ef
github.com/Jguer/yay/v12/pkg/dep.(*Grapher).addNodes(0xc000232140, {0x5586219b8c30, 0x558621c6f440}, 0xc000216210, {0xc0005a7c50, 0x10}, {0xc000232600?, 0x4, 0x55862199a180?}, 0x1)
	github.com/Jguer/yay/v12/pkg/dep/dep_graph.go:678 +0xe25
github.com/Jguer/yay/v12/pkg/dep.(*Grapher).addDepNodes(0xc000232140, {0x5586219b8c30, 0x558621c6f440}, 0xc0001f4700, 0x55862193eee0?)
	github.com/Jguer/yay/v12/pkg/dep/dep_graph.go:308 +0xbc
github.com/Jguer/yay/v12/pkg/dep.(*Grapher).AddDepsForPkgs(...)
	github.com/Jguer/yay/v12/pkg/dep/dep_graph.go:298
github.com/Jguer/yay/v12/pkg/dep.(*Grapher).GraphFromAUR(0xc000232140, {0x5586219b8c30, 0x558621c6f440}, 0x55862145a148?, {0xc000224120, 0x1, 0x1})
	github.com/Jguer/yay/v12/pkg/dep/dep_graph.go:475 +0xbb1
github.com/Jguer/yay/v12/pkg/dep.(*Grapher).GraphFromTargets(0xc000232140, {0x5586219b8c30, 0x558621c6f440}, 0x6?, {0xc000033e70, 0x1, 0x5586214de445?})
	github.com/Jguer/yay/v12/pkg/dep/dep_graph.go:187 +0x626
main.syncInstall({0x5586219b8c30?, 0x558621c6f440}, 0xc00024e070, 0xc0001b18f0, {0x5586219bcf08, 0xc000250000})
	github.com/Jguer/yay/v12/sync.go:49 +0x759
main.handleSync({0x5586219b8c30, 0x558621c6f440}, 0xc00024e070, 0xc0001b18f0, {0x5586219bcf08, 0xc000250000})
	github.com/Jguer/yay/v12/cmd.go:368 +0x8e5
main.handleCmd({0x5586219b8c30, 0x558621c6f440}, 0xc00024e070, 0xc0001b18f0, {0x5586219bcf08?, 0xc000250000?})
	github.com/Jguer/yay/v12/cmd.go:177 +0x345
main.main()
	github.com/Jguer/yay/v12/main.go:131 +0x6c9

After

Install the first option

yay -S libmediawiki
:: There are 2 providers available for kcoreaddons:
:: Repository AUR
    1) kcoreaddons-git 2) kf5-transition-dummy 

Enter a number (default=1): 
==>  -> EOF
AUR Dependency (1): kcoreaddons-git-5.240.0_r1871.g9a8845d4-1
AUR Make Dependency (1): extra-cmake-modules-git-5.246.0.r3657.11dd72b0-1
AUR Explicit (1): libmediawiki-git-5.37.0.r16.g8741b29-1
Sync Make Dependency (8): extra-cmake-modules-5.112.0-1, python-pyqt6-6.6.1-1, sip-6.8.0-1, clang-16.0.6-1, doxygen-1.9.8-1, python-requests-2.31.0-1, qt6-tools-6.6.1-1, python-sphinx-7.2.6-1
Sync Dependency (1): cmake-3.28.0-1
Sync Check Dependency (2): reuse-2.1.0-1, qt6-declarative-6.6.1-1
:: PKGBUILD up to date, skipping download: libmediawiki-git
:: PKGBUILD up to date, skipping download: kcoreaddons-git
:: PKGBUILD up to date, skipping download: extra-cmake-modules-git
  3 libmediawiki-git                         (Build Files Exist)
  2 kcoreaddons-git                          (Build Files Exist)
  1 extra-cmake-modules-git                  (Build Files Exist)
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 

[Jguer]

thanks for the fix @Juneezee