🐛 Fix signout command, return error instead of crash from signin command

[phatblat]

This is not a fix for the root cause but prevents a crash whenever the signin command is used on newer versions of macOS (10.13+). Users running older macOS versions (10.9-10.12) are unaffected.

Resolves the crasher reported in #107. See #164 for more details.

[todo]

Handle failed AppleID lookup

mas/App/AppStore/ISStoreAccount.swift

Lines 61 to 66 in 2518736

	} else {
	// TODO: Handle failed AppleID lookup
	print("No account found for username: \(username)")
	}
	group.leave()
	}

---

This comment was generated by todo based on a TODO comment in 2518736 in #162. cc @mas-cli.

[ldgmini]

	1 Warning
⚠️	😵 Big PR

Generated by 🚫 Danger