Client-side exception in reaction template picker

[daanboer]

To reproduce:

1. Go to https://demo.lxcat.net/scat-cs.
2. Select a contributor under "Set selection".
3. Select any species on the left- or right-hand side.
4. Deselect the previously selected contributor.

The result is a client-side exception with the message: TypeError: s[t] is undefined. This is rather nondescript, as the code is minified. The same error in a dev environment reads: Uncaught TypeError: data[particle] is undefined. The error originates in the StateSelect component:

LXCat/app/src/shared/state-select.tsx

Lines 48 to 50 in 208e473

	const electronicEntries = particle && particle !== OMIT_CHILDREN_KEY
	? data[particle].children
	: undefined;

Logging data and particle reveals the problem. As the referenced key on the particle level does not exist in the returned dictionary:

data:

{
  'State/907217': { latex: '\\mathrm{e}^-', valid: true, children: {} },
  'State/907496': {
    latex: '\\mathrm{CO}',
    valid: false,
    children: { 'State/907501': [Object] }
  },
  'State/908288': {
    latex: '\\mathrm{CO_{2}}',
    valid: false,
    children: { 'State/908293': [Object] }
  },
  'State/912125': {
    latex: '\\mathrm{N_{2}}',
    valid: false,
    children: { 'State/912130': [Object] }
  },
  'State/914351': {
    latex: '\\mathrm{O_{2}}',
    valid: false,
    children: { 'State/914356': [Object] }
  }
}

particle: State/909535