xdg-email: avoid passing empty kreadconfig return to desktop_file_to_binary
Fixes a warning from grep when the default MUA is unset in KDE 6:
grep: /home/foo/.local/share/applications//: Is a directory
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Fixes a warning from grep when the default MUA is unset in KDE 6:
grep: /home/foo/.local/share/applications//: Is a directory