Create asset fix geometry field value

[MV88]

Point geometry should be:

{
    "type": "Point",
    "coordinates": [ 10.4374221, 43.6524748 ]                  
}

instead of

{
   "type": "Point",
   "coordinates": [ [ 10.4374221, 43.6524748 ] ]
}

LineString geometry should be :

{
   "type": "LineString",
   "coordinates": [ [ 10.4374221, 43.6524748 ], [ 10.4374255, 43.6524755 ], ...optionalOtherPoints  ]
}

• where optionalOtherPoints are arrays of coordinates
• coordinates must have at least 2 points, otherwise throw a bad request error or similar