RFR: 8326979: (jdeps) improve the error message for FindException caused by InvalidModuleDescriptorException

[Mandy Chung]

Trivial fix.  Improve the error message to print the cause of the module resolution failure if present.

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Commit messages:
 - 8326979: (jdeps) improve the error message for FindException caused by InvalidModuleDescriptorException

Changes: https://git.openjdk.org/jdk/pull/18308/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18308&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326979
  Stats: 89 lines in 2 files changed: 88 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18308.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18308/head:pull/18308

PR: https://git.openjdk.org/jdk/pull/18308