Move the error handler to the api querier

to catch the ws normal close error for all Execute requests

internal/nomad/api_querier.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"github.com/gorilla/websocket"
 	nomadApi "github.com/hashicorp/nomad/api"
 	"github.com/openHPI/poseidon/internal/config"
 	"io"
@@ -99,7 +100,10 @@ func (nc *nomadAPIClient) Execute(runnerID string,
 		return 1, fmt.Errorf("error retrieving allocation info: %w", err)
 	}
 	exitCode, err := nc.client.Allocations().Exec(ctx, allocation, TaskName, tty, command, stdin, stdout, stderr, nil, nil)
-	if err != nil {
+	if err != nil && websocket.IsCloseError(err, websocket.CloseNormalClosure) {
+		log.WithError(err).Info("The exit code could not be received.")
+		return 0, nil
+	} else if err != nil {
 		return 1, fmt.Errorf("error executing command in allocation: %w", err)
 	}
 	return exitCode, nil