From cbc3d28217ee5514ebcda6fcd75ccd53d5052e29 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Tue, 11 Oct 2016 21:03:01 -0400
Subject: [PATCH] Ensured an exception is thrown if no machine to run a file is
 found. E.g. right now if you tried to open a ZX Spectrum .tap.

---
 OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift b/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift
index d709fef5b..a29f1fad4 100644
--- a/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift	
+++ b/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift	
@@ -120,6 +120,8 @@ class MachineDocument:
 		if let analyser = CSStaticAnalyser(fileAt: url) {
 			self.displayName = analyser.displayName
 			self.configureAs(analyser)
+		} else {
+			throw NSError(domain: "MachineDocument", code: -1, userInfo: nil)
 		}
 	}