Fix non-error throws on onerror handler on Firefox

src/raven.js

@@ -1369,7 +1369,7 @@ Raven.prototype = {
     var frames = [];
     if (stackInfo.stack && stackInfo.stack.length) {
       each(stackInfo.stack, function(i, stack) {
-        var frame = self._normalizeFrame(stack);
+        var frame = self._normalizeFrame(stack, stackInfo.url);
         if (frame) {
           frames.push(frame);
         }
@@ -1386,8 +1386,21 @@ Raven.prototype = {
     return frames;
   },
 
-  _normalizeFrame: function(frame) {
-    if (!frame.url) return;
+  _normalizeFrame: function(frame, stackInfoUrl) {
+    if (!frame.url) {
+      // Case when we don't have any information about the error
+      // E.g. throwing a string or raw object in Firefox
+      // Generating synthetic error doesn't add any value here
+      //
+      // We should probably somehow let user know that he should fix his code
+      return {
+        filename: stackInfoUrl, // fallback to whole stacks url from onerror handler
+        lineno: frame.line,
+        colno: frame.column,
+        function: frame.func || '?', // if we dont have a file url, we most likely won't have  a function name either
+        in_app: true // this will always come from the user's code
+      };
+    }
 
     // normalize the frames data
     var normalized = {