Fix result_from_string for empty return values

An empty string returned from a libnitrokey function can either indicate
an error or be a valid return value.  Previously, we assumed that it
indicates an error.  But instead, we should check the last command
status and use it to decide whether to return the empty string or an
error code.

This breaks the unit tests that assume that empty strings cause errors.
These will be fixed in the next patches.

0 files changed, 0 insertions, 0 deletions