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Description of problem:
When graphviz input file contains a syntax error, a empty image file is generated with a warning and an exit code 0.

The customer would like us to backport the existing fix: 

https://github.com/ellson/MOTHBALLED-graphviz/commit/181433391b1ea19caf999f91b14a50f0499b831e


Version-Release number of selected component (if applicable):
graphviz-2.30.1-21

How reproducible:
NA

Steps to Reproduce:
1.
2.
3.

Actual results:
See description

Expected results:
When the source document contains a syntax error, the program should stop with an error and an exit code > 0.

Additional info:
Sample input file requested to the customer.

Created attachment 1539588 [details]
graphviz sample document

The backport seems easy (one-liner) and safe.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (graphviz bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:3880