fix (cmd,pkg) : Potential Panic/Crash via Nil Pointer Dereference in Switch Context Command

[aniket866]

Description

If a user runs the context command on a fresh installation without a pre-existing configuration, config.ReadLocalConfig(...) returns nil, nil. The command checks for errors but not for nil values, and proceeds directly to access localCfg.CurrentContext:

localCfg, err := config.ReadLocalConfig(configPath)
errors.CheckError(err)
...
if localCfg.CurrentContext == ctxName {

This causes a runtime nil-pointer dereference panic.

Reason

Standard CLI usability dictates that commands should fail gracefully with a user-friendly message rather than panicking when no configuration is initialized.

Closes #462

[github-actions]

👋 @aniket866

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[aniket866]

@lbroudoux @Harsh4902
Please review whenver you get time

[aniket866]

hi @Harsh4902 I have done the required changes , now PR is ready to be reviewed, do whenever you get time

[Harsh4902]

LGTM. Thanks @aniket866

[github-actions]

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