Fix LT-22280: Yellow box when parsing a text

[jtmaxwell3]

This fixes https://jira.sil.org/browse/LT-22280 by improving the error message so that the user can fix the problem the caused the yellow box error. It also clears the task report message when finished.

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This change is 

[AndyBlack]

In XAmplePropertiesXAmpleDataFilesAugmenter.cs BuildAllomorphPropertyMapper(), consider changing
Dictionary<string, string> allomorphHvoPropertyMapper,
to be <string, List<string>> instead of <string, string>.
Then collect all the strings in the list for each hvo with a space between them and do the replace as
hvoMatch + " " + _those props_

[AndyBlack]

Reviewable status: 0 of 2 files reviewed, all discussions resolved