handle case where computer name is not set

Author: greggman

lib/computername.js

@@ -35,7 +35,11 @@ var computerName = "*unknown*";
 
 if (process.platform.toLowerCase() === 'darwin') {
   utils.execute('scutil', ['--get', 'ComputerName'], function(err, res) {  // eslint-disable-line
-    computerName = res.stdout.split()[0];
+    if (err) {
+      computerName = "unable to get computer name";
+    } else {
+      computerName = res.stdout.split()[0];
+    }
   });
 } else if (process.platform.substring(0, 3).toLowerCase() === "win") {
   computerName = process.env.COMPUTERNAME;