Coordinates for Marker not added to Point field when map is closed and then opened without refreshing page

[alexandercyu]

Steps for reproducing error:

1. Click "Location" button to open map modal
2. (Optional) Just to make sure Marker coordinates are being added to the Point field, click the Marker button and add a Marker to the map
3. Close the map modal
4. Open the map modal again
5. Click the Marker button and add a Marker to the map

Coordinates for the Marker are not added to the Point field

Issue is caused by attempt to stop error "Map container is already initialized." from occurring .

Workaround is for React, but works for plain Javascript as well:
PaulLeCam/react-leaflet#1133