auto-render: do not touch text nodes w/o formulas (#2154)
auto-render: do not touch text nodes w/o formulas (#2154)


xymostech/KaTeX,xymostech/KaTeX,xymostech/KaTeX,xymostech/KaTeX,Khan/KaTeX,xymostech/KaTeX,Khan/KaTeX,Khan/KaTeX