[jdk8u-dev] RFR: 8285696: AlgorithmConstraints:permits not throwing IllegalArgumentException when 'alg' is null

[Alexey Bakhtin]

This is a follow-up fix for the JDK-8285398: Cache the results of constraint checks
Simple fix to prevent JCK failure

This fix should be applied after JDK-8285398

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Commit messages:
 - 8285696: AlgorithmConstraints:permits not throwing

Changes: https://git.openjdk.org/jdk8u-dev/pull/382/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=382&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285696
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/382.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/382/head:pull/382

PR: https://git.openjdk.org/jdk8u-dev/pull/382