[chronojump] In case of chronojump-importer error: it shows the arguments passed to the Python script.

[Carles Pina i Estany <carlespina src gnome org>]

commit edcde807154dd81c83956ee4a1e89f5899d5882e
Author: Carles Pina i Estany <carles pina cat>
Date:   Sun Oct 16 17:54:42 2016 +0200

    In case of chronojump-importer error: it shows the arguments passed to the Python script.
    
    This helps debugging an existing issue and might help in the future for
    other possible issues.

 src/chronojumpImporter.cs |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/chronojumpImporter.cs b/src/chronojumpImporter.cs
index 687c307..2e318f9 100644
--- a/src/chronojumpImporter.cs
+++ b/src/chronojumpImporter.cs
@@ -184,6 +184,7 @@ class ChronojumpImporter
                                // The Python script has been executed and failed (syntax error, crashed).
                                // The error message will be in the output:
                                errorMessage = execute_result.allOutput;
+                               errorMessage += "\nArguments: " + String.Join (" ", parameters);
                        } else {
                                // The Python script has not been executed, return the error message from 
ExecuteProcess
                                errorMessage = execute_result.errorMessage;