Issue with parsing when two consecutive replies are on email from same person

When a person replies twice on the same thread via email consecutively, second time the email parsing seems buggy.

For example, see [this](https://github.com/duckduckgo/zeroclickinfo-goodies/issues/2834#issuecomment-205969733).

Review the linked example in zeroclickinfo-goodies issue #2834 and reproduce parsing a thread where the same person sends two consecutive replies. Trace the parser's handling of the second reply and add coverage for that case; done means both replies are parsed without the reported corruption.

Written by the indexing model from the issue text.