graphviz plugin misleading error message

[hadisfr]

Hi!
I tried graphviz plugin on some graphs and saw that it works on some of them but generates an error message "stream closed" and a message about checking if graphviz is installed. I could not find any further log.
After some tray-and-fail, I find out the problem is with non-English node ID/Labels, but it was hard to get a clue without any log or comprehensive message.
It would be very helpful to write raw Java exception message somewhere in the logs to debug in such situations.

[mbastian]

Hi @hadisfr and thank you for the report. Adding exceptions makes sense to me, maybe I can take a look at it.

Would you mind sharing a (sample) file so that I can reproduce the issue?

[dan-van]

See this pull request: #321
(and this proposed addition to that pull request: dan-van@e990347)