RFR: 8273324: IllegalArgumentException: fromIndex(0) > toIndex(-1) after clear and select TableCell

[Michael Strauß]

This PR fixes the exception thrown by the sample code in [8273324](https://bugs.openjdk.java.net/browse/JDK-8273324), while retaining the incorrect behavior in the scenario described.

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Commit messages:
 - fixed IllegalArgumentException

Changes: https://git.openjdk.java.net/jfx/pull/617/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=617&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273324
  Stats: 9 lines in 1 file changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/617.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/617/head:pull/617

PR: https://git.openjdk.java.net/jfx/pull/617