filter out empty keys

Author: hiddewie

proxy/js/features.mjs

@@ -17,8 +17,7 @@ const electrification_signals = all_signals.features.filter(feature => feature.t
 // TODO add links to documentation
 
 const requireUniqueEntries = array => {
-  const count = Object.groupBy(array, it => it[0]);
-  delete count['']; // icons with no name are used for icon composition
+  const count = Object.groupBy(array.filter(it => it[0]), it => it[0]);
   if (Object.values(count).some(it => it.length > 1)) {
     const offendingEntries = Object.entries(count).filter(it => it[1].length > 1).map(it => it[0]).join(', ');
     throw new Error(`entries must be unique, offending entries: ${offendingEntries}`);