Hola emeotero,
Yo probaría así...
Código PHP:
Ver original$query = "Select id, idcountry, idspecie, idstage, name,
description, weather, date,
idseason, season, idschool, name
FROM base.vw_observa where 1 = 1";
if($_POST["country"] != ""){
$query .= "AND idcountry = '$pais'";
}
//... resto de tu código
Espero que te sirva...