Handle (and show error) if some rows have no latitude/longitude

[gavinr]

If some rows have missing latitude/longitude, that will create invalid GeoJSON so we cannot include those rows.

UI should alert user to which rows were removed from the output GeoJSON

Example CSV:

Id,Name,Latitude,Longitude,a
153,aa,40.172000,-88.834000,b
154,bb,39.216000,-1.051000,b
155,cc,46.471000,-119.333000,b
434,dd,,,b

Outputs:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -88.834,
          40.172
        ]
      },
      "properties": {
        "Id": "153",
        "Name": "aa",
        "a": "b"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -1.051,
          39.216
        ]
      },
      "properties": {
        "Id": "154",
        "Name": "bb",
        "a": "b"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -119.333,
          46.471
        ]
      },
      "properties": {
        "Id": "155",
        "Name": "cc",
        "a": "b"
      }
    },
    {
      "type": "Feature",
      "geometry": {},
      "properties": {
        "Id": "434",
        "Name": "dd",
        "a": "b"
      }
    }
  ]
}

Expected:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -88.834,
          40.172
        ]
      },
      "properties": {
        "Id": "153",
        "Name": "aa",
        "a": "b"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -1.051,
          39.216
        ]
      },
      "properties": {
        "Id": "154",
        "Name": "bb",
        "a": "b"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -119.333,
          46.471
        ]
      },
      "properties": {
        "Id": "155",
        "Name": "cc",
        "a": "b"
      }
    }
  ]
}