message: Fix error if formateedHit[key] is null
diff: @@ -27,7 +27,7 @@ export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
  // formattedHit is the `_formatted` object returned by MeiliSearch.
  // It contains all the highlighted attributes
  return Object.keys(formattedHit).reduce((result, key) => {
  - let newHighlightString = formattedHit[key]
  + let newHighlightString = formattedHit[key] || ''
  // If the value of the attribute is a string,
  // the highlight is applied by MeiliSearch (<em> tags)
  // and we replace the <em> by the expected tag for InstantSearch
  