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The implementations that inheret from the LinkBase class are expected to implement a get_atr method. This method is mandatory, since it is one of the most basic functionalities of pySim to display an ATR. Also the ATR is sometimes needed to distinguish between different card models. The modem_atcmd and calypso implementation completely lack the get_atr method. Apparantly it is not possible to get an ATR in those environments, so lets add a dummy method there. Related: OS#6322 Change-Id: I4fc020ca45658af78e495a5c1b985213f83cbb50