openpgp: Improve error message.
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When an algorithm is completely disabled, don't say that it "is not considered secure since 1970-01-01T00:00:00Z" (i.e., the unix epoch), just say "is not considered secure".
- Fixes #1000 (closed).
When an algorithm is completely disabled, don't say that it "is not considered secure since 1970-01-01T00:00:00Z" (i.e., the unix epoch), just say "is not considered secure".