Raceresults: Check for 0 pxxs in results table

src/routes/data/raceresults/+page.svelte

@@ -54,6 +54,8 @@
       data_value_name: "pxxs",
       label: "Standing",
       valuefun: async (value: string): Promise<string> => {
+        if (value.length === 0 || value === "") return "";
+
         const pxxs_array: string[] = value.toString().split(",");
         const pxxs_codes: string[] = await Promise.all(
           pxxs_array.map(