RFR: 8339384: Unintentional IOException in jdk.jdi module when JDWP end of stream occurs

[Yagmur Eren]

A logic error in the block of code in com.sun.tools.jdi.TargetVM is fixed by putting fromByteArray() method within else statement to prevent invoking it when the array b is empty. See issue: [JDK-8339384](https://bugs.openjdk.org/browse/JDK-8339384)

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Commit messages:
 - fix the logic error by adding else to the if block not to invoke fromByteArray if array is empty

Changes: https://git.openjdk.org/jdk/pull/20815/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20815&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339384
  Stats: 3 lines in 1 file changed: 2 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20815.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20815/head:pull/20815

PR: https://git.openjdk.org/jdk/pull/20815