Do not separate errors and entries. Instead use something like Haskell's Maybe, but instead of an empty Nothing-object you return something which contains error information:

  def parseLogInteractively(file):
    entries = list()
    for line in file:
      entry = parseEntry(line)
      if entry.failed:
        entry = askToFixEntry(entry)
      entries.append(entry)
    return entries

A design question arises: Do you need to fix parse errors before you can proceed with next entry? If not, the error handling can be done by whomever calls parseLog.