Fixed debug build crash on mac, reading from stringstream into emtpy string crashed when compiling with clang
Fixed debug build crash on mac, reading from stringstream into emtpy string crashed when compiling with clang

git-svn-id: b66b41e514ff40863ef1aa95df2dbf63dd8d6be1@579 fdac6126-5c0c-442c-9429-916003d36597

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