tex2lyx assertion on master

[Scott Kostyshak]

The following chunk causes a tex2lyx assertion on current master, if I
paste as LaTeX (or if I save it to a file and import).

% excerpt from here:
% https://tex.stackexchange.com/a/280891/12212
\author[Short Name (U ABC)]{%
  \texorpdfstring{%
    \begin{columns}
      \column{.3333\linewidth}
      \centering
      Author 1 \\ Institute 1
      \column{.3333\linewidth}
      \centering
      Author 2 \\ Institute 2
      \column{.3333\linewidth}
      \centering
      Author 3 \\ Institute 3
    \end{columns}
 }
 {Author 1, Author 2, Author 3}
}

Scott
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