fix enum.Flag empty check

[b10902118]

Description

Fix the permission checks in Section by using enum.Flag.__bool__. For enum.Flag, != 0 always returns True, as the test below.

import enum

class Permission(enum.Flag):
    NONE = 0
    EXECUTE = 1
    WRITE = 2
    READ = 4
    ALL = 7

p = Permission(0)
print(p, p != 0)  # Permission.NONE True

The fixed functions are rarely called. I found this when porting Section to llef. I also have checked all != 0 and found no similar error.

• My code follows the code style of this project.
• My change includes a change to the documentation, if required.
• If my change adds new code, adequate tests have been added.
• I have read and agree to the CONTRIBUTING document.

[github-actions]

🤖 Coverage update for bca5b62 🟢

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Commit	ed10244	bca5b62
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[Grazfather]

Strange behaviour. But I confirmed. Thank you!