modem_atcmd: raise ProtocolError instead of ReaderError on CME ERROR

Also accept ProtocolError in addition to SwMatchError in filesystem.py
when probing for applications

Change-Id: I82b50408328f8eaaee5c9e311c4620d20f930642

pySim/filesystem.py

@@ -1352,7 +1352,7 @@ class RuntimeState:
                 if sw == "9000":
                     print(" %s: %s" % (f.name, f.aid))
                     apps_taken.append(f)
-            except SwMatchError:
+            except (SwMatchError, ProtocolError):
                 pass
         return apps_taken