runtime: Reset selected_file_fcp[_hex] if SELECT returns no data

In case SELECT doesn't return any response data, we must reset
the lchan.selected_file_fcp* members to None to prevent pySim-shell
preventing stale data from the previously selected file.

Change-Id: Ia04b8634e328e604e8df7e8d59b7fd532242d2ca
---
M pySim/runtime.py
1 file changed, 16 insertions(+), 0 deletions(-)

diff --git a/pySim/runtime.py b/pySim/runtime.py
index f836ec8..3aeaab1 100644
--- a/pySim/runtime.py
+++ b/pySim/runtime.py
@@ -304,6 +304,9 @@
             if select_resp_data:
                 self.selected_file_fcp_hex = select_resp_data
                 self.selected_file_fcp = self.selected_file.decode_select_response(select_resp_data)
+            else:
+                self.selected_file_fcp_hex = None
+                self.selected_file_fcp = None
 
         # register commands of new file
         if cmd_app and self.selected_file.shell_commands:

