fix delete alphabet/missing SG_REF bug
fix delete alphabet/missing SG_REF bug

karlnapf/shogun,shogun-toolbox/shogun,geektoni/shogun,Saurabh7/shogun,lisitsyn/shogun,sorig/shogun,besser82/shogun,Saurabh7/shogun,shogun-toolbox/shogun,lambday/shogun,shogun-toolbox/shogun,lambday/shogun,lambday/shogun,sorig/shogun,shogun-toolbox/shogun,karlnapf/shogun,lisitsyn/shogun,geektoni/shogun,besser82/shogun,sorig/shogun,besser82/shogun,Saurabh7/shogun,lisitsyn/shogun,Saurabh7/shogun,sorig/shogun,sorig/shogun,geektoni/shogun,Saurabh7/shogun,besser82/shogun,lambday/shogun,lisitsyn/shogun,lisitsyn/shogun,lambday/shogun,geektoni/shogun,Saurabh7/shogun,geektoni/shogun,besser82/shogun,besser82/shogun,lambday/shogun,Saurabh7/shogun,geektoni/shogun,Saurabh7/shogun,karlnapf/shogun,karlnapf/shogun,karlnapf/shogun,karlnapf/shogun,Saurabh7/shogun,lisitsyn/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,sorig/shogun