Fix: interpret missing level tag as 'level=0'

Logic/State/LayerState.ts

@@ -65,13 +65,18 @@ export default class LayerState {
             return
         }
         const t = Translations.t.general.levelSelection
+        const conditionsOrred = [
+            new Tag("level", "" + level),
+            new RegexTag("level", new RegExp("(.*;)?" + level + "(;.*)?")),
+        ]
+        if(level === "0") {
+            conditionsOrred.push(new Tag("level", "")) // No level tag is the same as level '0'
+        }
+        console.log("Setting levels filter to", conditionsOrred)
         this.globalFilters.data.push({
             id: "level",
             state: level,
-            osmTags: new Or([
+            osmTags: new Or(conditionsOrred),
-                new Tag("level", "" + level),
-                new RegexTag("level", new RegExp("(.*;)?" + level + "(;.*)?")),
-            ]),
             onNewPoint: {
                 tags: [new Tag("level", level)],
                 icon: "./assets/svg/elevator.svg",

Models/ThemeViewState.ts

@@ -270,6 +270,8 @@ export default class ThemeViewState implements SpecialVisualizationState {
                     for (const l of levels) {
                         floors.add(l)
                     }
+                }else{
+                    floors.add("0") // '0' is the default and is thus _always_ present
                 }
             }
             const sorted = Array.from(floors)