When I try to import mathml file like this:

```
<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mtable class="m-equation-square" displaystyle="true" style="display: block; margin-top: 1.0em; margin-bottom: 2.0em">
<mtr>
<mtd>
<mspace width="6.0em" />
</mtd>
<mtd columnalign="left">
<msup>
<mi>e</mi>
<mrow>
<mi>i</mi>
<mi>π</mi>
</mrow>
</msup>
<mo>=</mo>
<mo>-</mo>
<mn>1</mn>
</mtd>
</mtr>
</mtable>
</math>
```

I always get a “?” at the beginning of the formula (Up side down).

I think it is because it can interpret the mspace properly.

When I open the LibreOffice Math, I found it has empty entry of the first element in the MAXTRIX:

```
matrix {# {italic "e"^{italic "i" italic "π"} = - italic "1"}}
```

How could I fix this issue?