Changed HTTP code for deleting units

src/main/java/cz/hsrs/servlet/provider/ManagementService.java

@@ -261,15 +261,13 @@ public class ManagementService extends DBServlet {
 
     private JSON deleteUnit(JSONObject unitJson) throws SQLException, NoItemFoundException {
         Long deletedUnit = db.manUtil.deleteUnit(unitJson);
-        String message;
         if (deletedUnit != null) {
-            message = String.format("Unit '%s' was successfully deleted.", deletedUnit);
+            JSONObject resultJson = new JSONObject();
+            resultJson.put("message", String.format("Unit '%s' was successfully deleted.", deletedUnit));
+            return resultJson;
         } else {
-            message = "Unit can not be deleted.";
+            throw new SQLException("Unit can not be deleted.");
         }
-        JSONObject resultJson = new JSONObject();
-        resultJson.put("message", message);
-        return resultJson;
     }
 
     private JSON deleteSensor(JSONObject unitJson) throws SQLException, NoItemFoundException {