Fix the default logic in managing refs-filter

The refs-filter logic was inherently broken, by considering
an empty list of patterns as matching any string, potentially
blocking processing of ref-updates.

Align the logic between ExcludedRefsFilter and SyncRefsFilter
giving the same common logic of how to manage defaults.

Bug: Issue 15424
Change-Id: I7347555b30aafe94ae747440477f2a66ae71f34f
4 files changed
tree: d8b8a66cdce18b163e10a14deea25283006dea0f
  1. src/
  2. BUILD
  3. Jenkinsfile