Fix for bugs #1842 and #2012: RichText in cells crashes when not using LXML

Closed Christophe CURIS requested to merge topic/default/richtext-with-elementtree into branch/default

Hello, I have created a test that shows the problem (it appears only when using ElementTree instead of LXML, that's why it was not seen so far), followed by 2 commits to solve the issue. Best regards, Christophe.

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