The presence of an escape character in a text file causes a 422 from the back-end

[joanise]

If you have a text file which contains the escape character (\x1b / 27), and use that as the text file in Studio-Web step 1, you get this error from the GUI:

Doctoring the back-end to print the offending exception, I got this additional info:

PCDATA invalid Char value 27, line 492, column 24 (, line 492)

(My file only had 447 lines, but the last line had just char 27)

This means that Studio/readalongs/web_api.py gets invalid XML from create_ras_from_text() in the presence of an escape character in the text input.

[joanise]

Input file: copy the contents of https://gist.githubusercontent.com/joanise/83162fad7644d0f579d129a2dc8ceb22/raw/7657a05d417d861bcd1a134008c6e660b404870f/gistfile1.txt into the text box in the Studio-Web to reproduce the bug, or else download it and use it as file input.