* scd/command.c (update_reader_status_file): Add condition
ss->status == 0.
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To reproduce the bug: (1) insert card,
(2) run "gpg2 --card-status",
(3) remove card, (4) invoke "gpg2 --card-edit",
(5) invoke some command like "verify"
The last step fails (but with no error message to user).