When copying data from one archive to another, only set the error message in the reader to the error message from the writer if the error which occurred was in the writer.  This avoids error messages of "Empty error message" when extracting truncated archives.
When copying data from one archive to another, only set the error
message in the reader to the error message from the writer if the
error which occurred was in the writer.  This avoids error messages
of "Empty error message" when extracting truncated archives.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase