[chronojump] Fixed import session if importing database has not forceSensor table

[Xavier de Blas <xaviblas src gnome org>]

commit 7d9bc92396f4d4efd0230acbfbdb885e9331559c
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Sep 27 11:13:17 2019 +0200

    Fixed import session if importing database has not forceSensor table

 src/sqlite/session.cs | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)
---
diff --git a/src/sqlite/session.cs b/src/sqlite/session.cs
index 853c4ea6..4501ee32 100644
--- a/src/sqlite/session.cs
+++ b/src/sqlite/session.cs
@@ -580,19 +580,24 @@ class SqliteSession : Sqlite
                reader_enc.Close();
 
                //select force sensor of each session
-               dbcmd.CommandText = "SELECT sessionID, count(*) FROM " + Constants.ForceSensorTable +
-                       " GROUP BY sessionID ORDER BY sessionID";
-               LogB.SQL(dbcmd.CommandText.ToString());
-               dbcmd.ExecuteNonQuery();
-
-               SqliteDataReader reader_fs;
-               reader_fs = dbcmd.ExecuteReader();
                ArrayList myArray_fs = new ArrayList(2);
 
-               while(reader_fs.Read()) {
-                       myArray_fs.Add (reader_fs[0].ToString() + ":" + reader_fs[1].ToString() + ":" );
+               //if we are importing from a session who was not the forceSensor table (db version < 1.68)
+               if(tableExists(true, Constants.ForceSensorTable))
+               {
+                       dbcmd.CommandText = "SELECT sessionID, count(*) FROM " + Constants.ForceSensorTable +
+                               " GROUP BY sessionID ORDER BY sessionID";
+                       LogB.SQL(dbcmd.CommandText.ToString());
+                       dbcmd.ExecuteNonQuery();
+
+                       SqliteDataReader reader_fs;
+                       reader_fs = dbcmd.ExecuteReader();
+
+                       while(reader_fs.Read()) {
+                               myArray_fs.Add (reader_fs[0].ToString() + ":" + reader_fs[1].ToString() + ":" 
);
+                       }
+                       reader_fs.Close();
                }
-               reader_fs.Close();
 
 
                //mix nine arrayLists