[FIX]: Properly view geojson returned from a backend (#364)

Before this commit, the MapViewer was awaiting on loadData but that
function was not returning anything. This was causing the MapViewer to
always display an empty map.

This commit simply adds this missing return statement so MapViewer:renderMap
can work properly

Co-authored-by: mohamedkasem99 <kasem.personal@gmail.com>

Author: mktaha99

src/formats/format.js

@@ -43,6 +43,7 @@ export class Format {
 			this.data = await this.fetchData(connection);
 			this.loaded = true;
 		}
+		return this.data;
 	}
 
 	getData() {
@@ -120,4 +121,4 @@ export class UnsupportedFormat extends Format {
 
 export class FormatCollection extends SupportedFormat {
 
-}
+}