[dds/dap] Improve the error message when lookupResolvedPackageUris returns an invalid response + add a failing test for https://github.com/dart-lang/sdk/issues/52632 / https://github.com/flutter/flutter/issues/137163 This does not resolve the issue, it only makes it clearer from the error message what the problem is. Unfortunately there is no good workaround when we hit this bug because we can't tell which items in the response are valid/invalid. If we treat them all as invalid (eg. complete all of the completes with null), many things that involve mappings of URIs<->files won't work correctly (breakpoints, opening the right file when we break, etc.). A workaround is for users not to have commas in their filenames, although it's not clear if there may be other characters triggering this right now. Change-Id: I6ac7cbd82b726fac76c27d1e00a06f2a07d4757f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/342800 Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: Helin Shiah <helinx@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>
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