fixed null string error

app/DataAccess/RoutesDataAccess.php

             $dbo = new RoutesDbo();
             $dbo->setId($route["id"]);
             $dbo->setName($route["name"]);
-            $dbo->setBgColor($route["color"]);
-            $dbo->setFgColor($route["text_color"]);
+            $dbo->setBgColor($route["color"] == null ? "#ffffff" : $route["color"]);
+            $dbo->setFgColor($route["text_color"] == null ? "#aa0000" : $route["text_color"]);
             $dbos[] = $dbo;
         }
         return $dbos;