Fixed Bug 2518: NPE in ExtensionsManager.getExtensionsDirectory()
Fixed Bug 2518: NPE in ExtensionsManager.getExtensionsDirectory()

moduleFile can be null if there was a problem creating the extensions
directory.

git-svn-id: 3948e88432e1a59e1cb2bc472f8f957688004121@9053 67b53d14-2c14-4ace-a08f-0dab2b34000c

ethaneldridge/vassal,ethaneldridge/vassal,ethaneldridge/vassal