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pySim-trace: catch StopIteration exception on trace file end

When the trace file end is reaced, pyShark raises a StopIteration
exception. Let's catch this exception and exit gracefully.

Related: OS#6094
Change-Id: I6ab5689b909333531d08bf46e5dfea59b161a79e
---
M pySim-trace.py
1 file changed, 18 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/62/33962/1

diff --git a/pySim-trace.py b/pySim-trace.py
index 4561723..5990e32 100755
--- a/pySim-trace.py
+++ b/pySim-trace.py
@@ -102,7 +102,11 @@
         """Main loop of tracer: Iterates over all Apdu received from source."""
         while True:
             # obtain the next APDU from the source (blocking read)
-            apdu = self.source.read()
+            try:
+                apdu = self.source.read()
+            except StopIteration:
+                print("no more data, stop iteration.")
+                return 0
 
             if isinstance(apdu, CardReset):
                 self.rs.reset()

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