OpenStreetBrowserLoader/CategoryIndex: loading: improve error messages

src/CategoryIndex.js

@@ -11,9 +11,9 @@ function CategoryIndex (options, data, repository) {
   this.childrenDoms = {}
   this.childrenCategories = null
 
-  this._loadChildrenCategories(function (err) {
+  this._loadChildrenCategories((err) => {
     if (err) {
-      console.log('error loading child categories:', err)
+      console.log('Category "' + this.id + '": error loading child categories:', err)
     }
   })
 }

src/OpenStreetBrowserLoader.js

@@ -55,7 +55,7 @@ OpenStreetBrowserLoader.prototype.getCategory = function (id, options, callback)
     }
 
     if (!(ids.entityId in repoData.categories)) {
-      return callback(new Error('category not defined'), null)
+      return callback(new Error('category "' + ids.entityId + '" not defined'), null)
     }
 
     this.getCategoryFromData(ids.id, opt, repoData.categories[ids.entityId], function (err, category) {