Fix: Add check for valid location to handle NAN values (#1054)

lib/models/file.dart

@@ -193,8 +193,7 @@ class File extends EnteFile {
         if (Platform.isAndroid) {
           //Fix for missing location data in lower android versions.
           final Location? exifLocation = locationFromExif(exifData);
-          if (exifLocation?.latitude != null &&
+          if (Location.isValidLocation(exifLocation)) {
-              exifLocation?.longitude != null) {
             location = exifLocation;
           }
         }

lib/services/location_service.dart

@@ -243,9 +243,14 @@ class GPSData {
       return null;
     }
 
-    return Location(
+    final result = Location(
       latitude: latSign * (lat![0] + lat![1] / 60 + lat![2] / 3600),
       longitude: longSign * (long![0] + long![1] / 60 + long![2] / 3600),
     );
+    if (Location.isValidLocation(result)) {
+      return result;
+    } else {
+      return null;
+    }
   }
 }