[longomatch] Fix cancelling imports with more than 1 option

[Andoni Morales Alastruey <amorales src gnome org>]

commit 02ba5d9b37c6dbc87f9f7c7f9119bf19fe17a2f4
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Tue Feb 3 18:17:47 2015 +0100

    Fix cancelling imports with more than 1 option

 LongoMatch.Services/Services/ToolsManager.cs |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.Services/Services/ToolsManager.cs b/LongoMatch.Services/Services/ToolsManager.cs
index c595d7d..c44591a 100644
--- a/LongoMatch.Services/Services/ToolsManager.cs
+++ b/LongoMatch.Services/Services/ToolsManager.cs
@@ -162,6 +162,9 @@ namespace LongoMatch.Services
                                } else {
                                        importer = ChooseImporter (importers);
                                }
+                               if (importer == null) {
+                                       return;
+                               }
                                project = importer.ImportFunction (fileName);
                                if (importer.NeedsEdition) {
                                        Config.EventsBroker.EmitNewProject (project);