RFR: 8312126: NullPointerException in CertStore.getCRLs after 8297955

[Sean Mullan]

Please review this fix for a regression in the LDAP CertStore implementation where a null CRL issuerName in an X509CRLSelector should be treated as a CertStoreException instead of a NullPointerException.

A new test has been added but requires internal infrastructure so will only be in the closed.

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Commit messages:
 - Initial fix.

Changes: https://git.openjdk.org/jdk/pull/15745/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15745&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312126
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15745.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15745/head:pull/15745

PR: https://git.openjdk.org/jdk/pull/15745