Better failure message when something is thrown that's not an error

Change from 'undefined : undefined' to '<thing that was thrown> thrown'

Pointed out by @charleshansen

src/core/ExceptionFormatter.js

@@ -1,9 +1,13 @@
 getJasmineRequireObj().ExceptionFormatter = function() {
   function ExceptionFormatter() {
     this.message = function(error) {
-      var message = error.name +
-        ': ' +
-        error.message;
+      var message = '';
+
+      if (error.name && error.message) {
+        message += error.name + ': ' + error.message;
+      } else {
+        message += error.toString() + ' thrown';
+      }
 
       if (error.fileName || error.sourceURL) {
         message += " in " + (error.fileName || error.sourceURL);