We have a case, where Coverage.py produces cobertura.xml and we are trying to convert it to html with ReportGenerator.
In the cobertura.xml line-elements are missing branch-attributes and therefore html generation fails. The result is "Object reference not set to an instance of an object."
According to http://cobertura.sourceforge.net/xml/coverage-03.dtd missing branch-attribute should default to "false" but ReportGenerator assumes the attribute is required.
Will change this in the next days.
New release is available:
https://www.nuget.org/packages/ReportGenerator/4.0.9
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Will change this in the next days.