[pkg-gnupg-maint] Bug#1129944: pinentry-qt: immediate crash if X display is not available

[Vincent Lefevre]

This also fails:

qaa:~> env -u DISPLAY pinentry-qt --help
qt.qpa.xcb: could not connect to display
[...]

with no help displayed.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)