Can one of you guys update the reporter to gracefully handle if
jpgraph is not present? I suggest making a simple "include" test to
see if jpgraph is available (or even a file_exists() test? whatever
works/is easier), and if it isn't, print a simple message about
"JpGraph is not available, so no graphs are shown" or somesuch, but
keep the links to the raw data.
Extra bonus points if you put the hook in config.inc to allow jpgraph
to be available at some non-default location. ;-)