graph: don't call string_copy_rev() on empty string #98
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graph_expand() calls graph_insert_column() with the empty string as id,
which in turns leads to string_copy_rev() reading outside the allowed
memory area looking for whitespace.
To avoid this, don't call string_copy_rev() if we know the string is
empty anyway.
Signed-off-by: Romain Francoise romain@orebokech.com