in ligo ide, using the "Compile Expression" feature when code has syntax errors causes the front-end to hang

Steps to reproduce:

0. on https://ide-staging.ligolang.org/
1. In Ligo web ide, Cameligo view, enter kjkhl on the line after the subtract definition.
2. Select "Compile Expression"
3. Click Run and it will hang forever.
   1. Look in dev tools and you will see a 400 from the backend that contains the ligo compiler error.