* fix: return error from rdapQuery when no expiration event found
When an RDAP response has no expiration event, rdapQuery returned a
zero-value ExpirationDate with nil error. This prevented
GetDomainExpiration from falling back to WHOIS, causing failures
for TLDs like .net where RDAP may omit the expiration event.
Signed-off-by: majiayu000 <1835304752@qq.com>
* fix: include hostname in RDAP error and add .net domain tests
Add .net domain test cases to TestRdapQuery and TestGetDomainExpiration
to cover the fallback path when RDAP lacks an expiration event (#1570).
Include hostname in the error message for easier debugging.
Signed-off-by: majiayu000 <1835304752@qq.com>
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Signed-off-by: majiayu000 <1835304752@qq.com>
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