Revert "Revert "remove empty map layer""

This reverts commit 86d437a609.

This fixes #1051

app/map_styles/polygon.xml

@@ -361,8 +361,6 @@
             <LineSymbolizer stroke="#888" stroke-width="3.0"/>
         </Rule>
     </Style>
-    <Style name="empty_map">
-    </Style>
     <Style name="conservation_area">
         <Rule>
             <PolygonSymbolizer fill="#73ebaf" />

app/src/frontend/config/category-maps-config.ts

@@ -248,15 +248,6 @@ export const categoryMapsConfig: {[key in Category]: CategoryMapDefinition[]} =
                     { color: '#8500d4', text: 'In Archaeological Priority Area'},
                 ]
             },
-        },
-        {
-            mapStyle: 'empty_map',
-            legend: {
-                title: 'Empty map',
-                disclaimer: 'This is an empty map to see overlays without distraction.',
-                elements: [
-                ]
-            },
         }
     ],
     [Category.Sustainability]: [{

app/src/frontend/config/tileserver-config.ts

@@ -15,7 +15,6 @@ export type BuildingMapTileset = 'date_year' |
     'planning_applications_status_recent' |
     'planning_applications_status_very_recent' |
     'planning_combined' |
-    'empty_map' |
     'sust_dec' |
     'building_attachment_form' |
     'landuse' |

app/src/tiles/dataDefinition.ts

@@ -191,13 +191,6 @@ const LAYER_QUERIES = {
             OR planning_heritage_at_risk_url <> ''
             OR planning_in_apa_url <> ''
             `,
-    empty_map: `
-        SELECT
-            geometry_id
-        FROM
-            buildings
-        WHERE
-            sust_dec IS NOT NULL`,
     conservation_area: `
         SELECT
             geometry_id