Don't process a falsey error message

Trying to fix #76

src/raven.js

@@ -439,6 +439,13 @@ function extractContextFromFrame(frame) {
 function processException(type, message, fileurl, lineno, frames, options) {
     var stacktrace, label, i;
 
+    // Sometimes an exception is getting logged in Sentry as
+    // <no message value>
+    // This can only mean that the message was falsey since this value
+    // is hardcoded into Sentry itself.
+    // At this point, if the message is falsey, we bail since it's useless
+    if (!message) return;
+
     // IE8 really doesn't have Array.prototype.indexOf
     // Filter out a message that matches our ignore list
     i = globalOptions.ignoreErrors.length;

test/raven.test.js

@@ -451,6 +451,13 @@ describe('globals', function() {
         extra: 'awesome'
       }]);
     });
+
+    it('should ignored falsey messages', function() {
+      this.sinon.stub(window, 'send');
+
+      processException('Error', '', 'http://example.com', []);
+      assert.isFalse(window.send.called);
+    });
   });
 
   describe('send', function() {