build(owl-bot-java): don't crash if there are no clirr-ignore-difference.xml files (#1218) (#542)
build(owl-bot-java): don't crash if there are no clirr-ignore-difference.xml files (#1218) (#542)

Source-Link: https://github.com/googleapis/synthtool/commit/86bcb66b1684191cf177145c6a9656b996a9dc7c
Post-Processor: 48d5800083e04fbe06b7d85b0e411aebd73b5710@sha256:db1616f2f70823d8381d859835229e04371d14f59ac78063c5af73c55c3fffbb

Co-authored-by: Owl Bot <7f39581e9a7ddb69f3fa3e6fc69a582ea2916fc9@users.noreply.github.com>
googleapis/java-bigqueryconnection,googleapis/java-bigqueryconnection,googleapis/java-bigqueryconnection