[jdk17u-dev] RFR: 8268582: javadoc throws NPE with --ignore-source-errors option

[Alexey Pavlyutkin]

I'd like to backport JDK-8268582 to jdk17u-dev

The patch fixes javadoc NPE when using the --ignore-source-errors option with an non-existing type.

Original patch applied cleanly

Verification: `javadoc --ignore-source-errors ./Test.java` where Test.java has the following content


import invalid.example.OtherClass;

public class Test<T> extends OtherClass<T> {

}


Regression: langtools_javadoc (20.04/amd64)

-------------

Commit messages:
 - Backport 0dfb3a705d2ad0ce4ac0f7dd18fb65d7ae735f16

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/152/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=152&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268582
  Stats: 21 lines in 2 files changed: 16 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/152.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/152/head:pull/152

PR: https://git.openjdk.java.net/jdk17u-dev/pull/152