[chronojump] After an error importing, do not show the error message again on successful import

[Xavier de Blas <xaviblas src gnome org>]

commit 53c1670bca41707eff2eecbd70e7e75751bb0988
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Oct 26 15:44:03 2020 +0100

    After an error importing, do not show the error message again on successful import

 src/gui/chronojumpImporter.cs | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/gui/chronojumpImporter.cs b/src/gui/chronojumpImporter.cs
index 52857754..9ac5cfc0 100644
--- a/src/gui/chronojumpImporter.cs
+++ b/src/gui/chronojumpImporter.cs
@@ -210,6 +210,8 @@ public partial class ChronoJumpWindow
 
                        reloadSession ();
 
+                       app1s_scrolledwindow_import_error.Visible = false;
+
                        //chronojumpImporter.showImportCorrectlyFinished ();
                        app1s_ShowLabelImportedOk();
                } else {