RFR: 8361587: AssertionError in File.listFiles() when path is empty and -esa is enabled [v3]

[Brian Burkhalter]

> Changes to address `File.listFiles` invoked on an empty path. This fixes an oversight in #22821.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8361587: Expand test coverage of File methods

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26224/files
  - new: https://git.openjdk.org/jdk/pull/26224/files/76b4439c..afaa9329

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26224&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26224&range=01-02

  Stats: 50 lines in 1 file changed: 50 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26224.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26224/head:pull/26224

PR: https://git.openjdk.org/jdk/pull/26224