Verify changes in check pipeline when no job is triggered

This is useful in cases where a change modifies the docs, because in
those cases jobs aren't triggered.

Change-Id: I7cd017e4d5d6d3ac8b4951af22c0eea9ec336ff4
1 file changed
tree: a3d16869e8fe7410dba456693bcd41f4386bf3f8
  1. playbooks/
  2. zuul.d/