Message 391673 - Python tracker

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Content 
OpenSSL 3.0.0-alpha15 handles empty data input to d2i_X509_bio() and PEM_read_bio_X509() differently. This causes cadata test for invalid data to fail with inconsistent error message.

Let's handle 0 result case more consistent and raise an error message that is more understandable than "no start line" or "not enough data".