RFR: 7903229: ParameterFilter - check initFiles for any File with an empty path

[Dmitry Bessonov]

ParameterFilter.java : method `update` could check check initFiles (which is result of `stringsToFiles()` call) for any File with an empty path

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Commit messages:
 - 7903229: ParameterFilter - check initFiles for any File with an empty path

Changes: https://git.openjdk.org/jtharness/pull/33/files
 Webrev: https://webrevs.openjdk.org/?repo=jtharness&pr=33&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903229
  Stats: 8 lines in 1 file changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jtharness/pull/33.diff
  Fetch: git fetch https://git.openjdk.org/jtharness pull/33/head:pull/33

PR: https://git.openjdk.org/jtharness/pull/33