Remove blank lines in LaTeX displaymath

[siwelwerd]

LaTeX does not allow blank lines in displaymath. However, if one is not careful, the template can generate this. Example: https://github.com/StevenClontz/checkit-tbil-la-2021-dev/blob/65dc25b4f6c45a4d0992aa8701b984a19665e614/outcomes/LE4.xml#L12

Code:

Consider the following
{{#system}}
system of linear equations.
{{/system}}
{{#vec_eq}}
vector equation.
{{/vec_eq}}
      <me>
          {{system}}
          {{vec_eq}}
      </me>

If system or vec_eq is not defined (which should always happen here), this inserts a blank line before the vector equation, which causes an error in compiling LaTeX. This can probably be fixed by the user here by

<me>
       {{system}} {{vec_eq}}
</me>

but it would be ideal for Checkit to, whenever it encounters <me>, gobble up any blank lines.