Merge "Improve error message in debuggerd fallback handler." am: d0642a373d am: c950673062 am: 4dc3ffbb53

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1439573

Change-Id: I4c50aee5fa7ceda8c58e1a1fb8ad036f7e84177a