Update Services.dart

es un poco mas claro que tipo de error se obtiene

fast_med_flutter/lib/widgets/DataTableMySqlDemo/Services.dart

       var map = Map<String, dynamic>();
       map['action'] = _GET_ALL;
       //print('antes');
-      // final response = await http.get(URL_GET_ALL);
+      final response = await http.get(URL_GET_ALL);
       // print('despues');
       // print('getOficinas Response: ${response.body}');
-      // if (200 == response.statusCode) {
-      //   List<Oficina> list = parseResponse(response.body);
-      final response = '[{"id":"1","name":"test1"},{"id":"2","name":"test2"},{"id":"3","name":"test3"}]';
-      //print('despues');
-      //print('getOficinas Response: $response');
-      if (200 == 200) {
-        List<Oficina> list = parseResponse(response);
+      if (200 == response.statusCode) {
+        List<Oficina> list = parseResponse(response.body);
+
         return list;
       } else {
-        return List<Oficina>();
+        final response = '[{"id":"1","name":"no"},{"id":"2","name":"respondio"},{"id":"3","name":"code: 200"}]';
+        List<Oficina> list = parseResponse(response);
+        return list; // return an empty list on exception/error
       }
     } catch (e) {
-      return List<Oficina>(); // return an empty list on exception/error
+      final response = '[{"id":"1","name":"este"},{"id":"2","name":"es el"},{"id":"3","name":"catch(e)"}]';
+      List<Oficina> list = parseResponse(response);
+      return list; // return an empty list on exception/error
     }
   }