Radar metadata with `" "` values

[peterdesmet]

The following records have " " (space) values rather than "" (empty values). This should be updated to "" to allow better conditional filtering:

{
    "number": "1367",
    "country": "Croatia",
    "countryid": " ", <--
    "oldcountryid": " ", <--
    "wmocode": " ", <--
    "odimcode": " " <--
},
{
    "number": "1369",
    "country": "Croatia",
    "countryid": " ", <--
    "oldcountryid": " ", <--
    "wmocode": " ", <--
    "odimcode": " " <--
},
 {
    "number": "1137",
    "country": "Germany",
    "singlerrr": " ", <--
    "compositerrr": " " <--
},
  {
    "number": "1148",
    "country": "Germany",
    "wrwp": " " <--
  },
  {
    "number": "1203",
    "country": "Italy",
    "wrwp": " " <--
  },
{
    "number": "1386",
    "country": "Italy",
    "singlerrr": " ", <--
    "compositerrr": " " <--
  },
{
    "number": "1191",
    "country": "Italy",
    "wmocode": " ", <--
    "odimcode": " ", <--
    "heightofstation": " ", <--
    "diameterantenna": " ", <--
    "beam": " ", <--
    "gain": " ", <--
    "frequency": " " <--
},
{
    "number": "1298",
    "country": "Romania",
    "singlerrr": " " <--
},

[peterdesmet]

All these issues have returned