Student view breaks when typing in the search panel
As soon as you type anything into the search panel in the student view the UI breaks.
The error: TypeError: react_dom__WEBPACK_IMPORTED_MODULE_1___default.a.findDOMNode(...).getElementById is not a function
The line in question is the following: https://gitlab.kwant-project.org/zesje/zesje/blame/master/client/views/students/SearchPanel.jsx#L41