Empty queries can be part of an effective search strategy. They're what allow you to show results to your users before they've even had to search. However, they're not always useful when included in your analytics.
If you don't want empty queries to be included in your Search Analytics, you can set the analytics search parameter to false for all empty queries.
We have more information on this topic in our docs - https://www.algolia.com/doc/guides/getting-analytics/search-analytics/out-of-the-box-analytics/how-to/how-to-remove-empty-search-from-analytics/