SpoutDev/Spout — pull request #1947 by zhuowei (2012-07-25 21:53:28+00:00)
Title: Fixed an "invalid inferred types for U" error when compiling

When compiling on OpenJDK 1.6.0_24, this error shows up:
```[ERROR] /media/extstorage/docs/repos/spout/Spout/src/main/java/org/spout/engine/filesystem/WorldFiles.java:[368,45] invalid inferred types for U; inferred type does not conform to declared bound(s)```
Casting the null parameter passed in to a CompoundMap seems to fix the problem.
Signed-off-by: Zhuowei Zhang