Fix crashes with empty script files

fix-empty-files.patch

Index: source/lib/file/vfs/vfs.cpp
===================================================================
--- source/lib/file/vfs/vfs.cpp	(revision 11448)
+++ source/lib/file/vfs/vfs.cpp	(working copy)
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010 Wildfire Games
+/* Copyright (c) 2012 Wildfire Games
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -178,6 +178,13 @@
 					RETURN_STATUS_IF_ERR(file->Loader()->Load(file->Name(), fileContents, file->Size()));
 				}
 			}
+			else
+			{
+				// we reserve a cache of size 1 to allow loading of empty files
+				// (previosly such files caused crashed)
+				fileContents = m_fileCache.Reserve(1);
+				m_fileCache.Add(pathname, fileContents, 1);
+			}
 		}
 
 		stats_io_user_request(size);