RFR: Codetools 7902736

[Alexandre Iline]

Add selected text to the dump, whether or not the test is empty. Add empty string for null return value.

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Commit messages:
 - copyrights
 - CODETOOLS-7902736: Add selected text to the dump for text components

Changes: https://git.openjdk.java.net/jemmy-v2/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jemmy-v2&pr=2&range=00
  Stats: 106 lines in 5 files changed: 100 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jemmy-v2/pull/2.diff
  Fetch: git fetch https://git.openjdk.java.net/jemmy-v2 pull/2/head:pull/2

PR: https://git.openjdk.java.net/jemmy-v2/pull/2