Before this patch:
$ ./pySim-shell.py -p 0
Card reader initialization failed with an exception of type:
<class 'pySim.exceptions.ReaderError'>
after:
$ ./pySim-shell.py -p 0
Card reader initialization failed with exception:
No reader found for number 0
Change-Id: Id08c4990857f7083a8d1cefc90ff85fc20ab6fef