latex(Array, mat_str="array") emits bad latex

[eric-wieser]

There is a bug in sympy.printing.latex.LatexPrinter._print_NDimArray:

print(sympy.latex(sympy.Array([[[1]]]), mat_str='array'))

gives

\left[\begin{array}\left[\left[\begin{array}1\end{array}\right]\right]\end{array}\right]

This should be

\left[\begin{array}{c}\left[\left[\begin{array}1\end{array}\right]\right]\end{array}\right]

Otherwise the 1 is swallowed as an argument to the align environment.