[automerger skipped] Handle case where checkstyle does not return 2 lines. am: e1510db8d1 -s ours

am skip reason: Change-Id Ia27b93eafd7471f3886e4d3a4080a63dc5e8e935 with SHA-1 222ffec85d is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/checkstyle/+/12129281

Change-Id: I38cea7f18e487010030f99362d196e3e24b7b37c