Fix error reporting bug

Author: crisptrutski

src/loader.js

@@ -260,7 +260,7 @@ function logloads(loads) {
               // store the deps as load.deps
               load.declare = declare;
               load.depsList = deps;
-            }            
+            }
             __eval(transpiled, __global, load);
             curSystem.register = curRegister;
           });
@@ -512,10 +512,11 @@ function logloads(loads) {
   function linkSetFailed(linkSet, load, exc) {
     var loader = linkSet.loader;
 
-    if (linkSet.loads[0].name != load.name)
+    if (load && linkSet.loads[0].name != load.name)
       exc = addToError(exc, 'Error loading "' + load.name + '" from "' + linkSet.loads[0].name + '" at ' + (linkSet.loads[0].address || '<unknown>') + '\n');
 
-    exc = addToError(exc, 'Error loading "' + load.name + '" at ' + (load.address || '<unknown>') + '\n');
+    if (load)
+      exc = addToError(exc, 'Error loading "' + load.name + '" at ' + (load.address || '<unknown>') + '\n');
 
     var loads = linkSet.loads.concat([]);
     for (var i = 0, l = loads.length; i < l; i++) {