How to use the -failfast2 option to not generate the image on errors?

[evandrocoan]

PlantUml has a command line option http://plantuml.com/command-line -failfast2 which:

There is also a -failfast2 flag that does a first checking pass. If some error is present, no diagram will be generated at all. In case of error, -failfast2 runs even faster than -failfast, which may be useful for huge project.

How to enabled it on the PlantUml-server

[evandrocoan]

I handled to overcome this by checking the HTTP header and looking for the X-PlantUML-Diagram-Error string. If present, then there was an error, and I just discard the image:

1. evandrocoan/plantumlconnection@37b5142 Improved the error handling on diagram_plugin.py
2. evandrocoan/PlantUmlDiagrams@bba59e5 Improved the error handling on diagram_plugin.py