Фикс функции фильтрации диагнозов, фикс фиьлтрации по датам

Polyclinic/PolyclinicDatabaseImplement/Implements/DiagnoseStorage.cs

@@ -50,7 +50,11 @@ namespace PolyclinicDatabaseImplement.Implements
             }
             if (model.To != null)
             {
-                elements = elements.Where(x => x.DateStopDiagnose <= model.To.Value).ToList();
+                elements = elements
+                    .Where(x => x.DateStartDiagnose <= model.To.Value)
+                    .Where(x => x.DateStopDiagnose != null)
+                    .Where(x => x.DateStopDiagnose <= model.To.Value)
+                    .ToList();
             }
             return elements;
         }