CategoryOverpassFilter: replace 'defaultQuery' by 'emptyQuery'

doc/Filters.md

@@ -37,7 +37,7 @@ Each filter can define the following values:
   * 'strsearch' query string parts (e.g. "kai keb" would match "Kaiser Kebap") and query character variants (e.g. "cafe" would match "café").
 * show_default: if true, this filter will be shown by default, others need to be added via the select box.
 * placeholder: a text which is shown as placeholder (Twig enabled)
-* defaultQuery: A filter query which is added when no value is selected.
+* emptyQuery: A Overpass filter query which is added, when no value is selected.
 
 ### Values
 #### Array

src/CategoryOverpassFilter.js

@@ -169,7 +169,7 @@ class CategoryOverpassFilter {
       let d = this.data[k]
 
       if (values === null) {
-        return null
+        return d.emptyQuery
       }
 
       if (!Array.isArray(values)) {
@@ -233,15 +233,6 @@ class CategoryOverpassFilter {
       }
     }).filter(f => f) // remove null values
 
-    const defaultQueries = Object.keys(this.data)
-      .map(k => {
-        if (!param[k]) {
-          return this.data[k].defaultQuery
-        }
-      })
-      .filter(f => f)
-    this.additionalFilter = this.additionalFilter.concat(defaultQueries)
-
     if (this.additionalFilter.length === 0) {
       this.additionalFilter = []
     } else if (this.additionalFilter.length === 1) {