If I have a dashboard View that has jobs for PyLint and JSLint, when trying to setup a trend graph it will not work because there are two kinds of lint issues. When I have a dashboard View that has only JSLint OR PyLint, but not both, I get to see the trend graph.

So: PyLint job + separate JSLint job in same dashboard View = no trend graph
Just PyLint job or just JSLint job in same dashboard View = trend graph works.

The message I see when I try to setup a trend graph in a dashboard View that has both JSLint and PyLint jobs is:

"There are no results available. Did you enable the plug-in in the jobs that are part of this view?"

NOTE: I am not able to select the type of warnings parser (JSLint or PyLint) when configuring the portlet, which I can for some other portlets.