Charter plot issues

[johnblommers]

For the following Markdown file we find that the HTML and PDF exports contain the Charter plot. The ODT and DOCX export files plots are not embedded. And for the LaTeX export the TEX file won't compile with Gummi citing an error at the line \end{axis}

The Markdown file:

```charter
title: reconstruction error vs compression
x-axis:
	    label: compression
	    mode: linear
y-axis:
    label: mse
plot:
    x: 1 10  50 80
    y: 0 01 03  05
    label: f_avg
    marker: s
    ls: --
```

The TEX export is

\documentclass[a4paper, 10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{cite}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{algorithmic}
\usepackage{float}
\usepackage{hyperref}
\usepackage{graphicx}
\usepackage{textcomp}
\usepackage{listings}
\usepackage{epsfig}
\usepackage{tikz}
\usepackage{pgfplots}

\pgfplotsset{compat=1.15}

\providecommand{\keywords}[1]{{\bf{\em Index terms---}} #1}
\newfloat{program}{thp}{lop}
\floatname{program}{Listing}

\begin{document}

\begin{tikzpicture}
\begin{axis}[
	grid=both,
	title={reconstruction error vs compression},
	xlabel={compression},
	ylabel={mse},
]
\addplot[
	line width = 1.000000pt,
	dashed,
	mark=square*,
] table {
	1.000000 0.000000
	10.000000 1.000000
	50.000000 3.000000
	80.000000 5.000000
};
\addlegendentry{f_avg}
\end{axis}
\end{tikzpicture}

\end{document}