Let's print a stack trace when there's an error in the completeCallback,

it could be a ways inside it and we want to help people debug.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4970 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/MultiLoader.as

@@ -244,7 +244,8 @@ public class MultiLoader
         try {
             _complete(thisResult);
         } catch (err :Error) {
-            trace("MultiLoader: Could not call completeCallback: " + err);
+            trace("MultiLoader: Error calling completeCallback [result=" + thisResult + "].");
+            trace("Cause: " + err.getStackTrace());
         }
     }