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Fix #1901289 [Cannot communicate with Sony PRS 650](https://bugs.launchpad.net/calibre/+bug/1901289)

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Kovid Goyal 2020-10-24 13:24:46 +05:30
parent e0c9b3cdbc
commit 0b973057d0
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1 changed files with 4 additions and 1 deletions
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5
src/calibre/devices/usbms/books.py
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@ -24,7 +24,10 @@ def none_cmp(xx, yy):
y = yy[1]
if x is None and y is None:
# No sort_key needed here, because defaults are ascii
return cmp(xx[2], yy[2])
try:
return cmp(xx[2], yy[2])
except TypeError:
return 0
if x is None:
return 1
if y is None: