RFR: 7076: Rules and Analysis code has exceptions during uitests [v3]

[Henrik Dafgård]

> Fixes exceptions encountered during uitests due to empty grouping arrays.

Henrik Dafgård has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/189/files
  - new: https://git.openjdk.java.net/jmc/pull/189/files/5c35cbf6..3180bba8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=189&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=189&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/189.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/189/head:pull/189

PR: https://git.openjdk.java.net/jmc/pull/189