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This avoids addCleanup ordering errors and also errors when we may try to
print an invalid stdout pipe (like when we have processed it all), as python
might fail with something like:
======================================================================
ERROR: test_fprintd_multiple_verify_fails (__main__.TestFprintdUtilsVerify)
----------------------------------------------------------------------
Traceback (most recent call last):
File "~/GNOME/fprintd/tests/test_fprintd_utils.py", line 102, in <lambda>
self.addCleanup(lambda: print(process.stdout.read()))
File "/usr/lib/python3.8/codecs.py", line 321, in decode
data = self.buffer + input
TypeError: can't concat NoneType to bytes