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pySim-trace: Support SELECT with empty response body

If the modem/UE doesn't ask for the FCP to be returned, a SELECT
can exit with 9000 and no response body.  Don't crash in that case.

Change-Id: I66788717bec921bc54575e60f3f81adc80584dbc
---
M pySim/apdu/ts_102_221.py
1 file changed, 3 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/62/28762/1

diff --git a/pySim/apdu/ts_102_221.py b/pySim/apdu/ts_102_221.py
index 9ecc2c9..e5455d0 100644
--- a/pySim/apdu/ts_102_221.py
+++ b/pySim/apdu/ts_102_221.py
@@ -95,7 +95,9 @@
         # decode the SELECT response
         if self.successful:
             self.file = lchan.selected_file
-            return lchan.selected_file.decode_select_response(self.rsp_dict['body'])
+            if 'body' in self.rsp_dict:
+                # not every SELECT is asking for the FCP in response...
+                return lchan.selected_file.decode_select_response(self.rsp_dict['body'])
         return None
 
 

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