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python: Allow ovs-flowviz to run without graphviz.
The graphviz library has a large set of dependencies, and as such it may be desireable to not install it by default. Before this patch execution of ovs-flowviz would end in ImportError when graphviz is unavailable. Exit with a friendly message instead, allowing the user to consume the parts of the program that do not depend on graphviz. Signed-off-by: Frode Nordahl <[email protected]> Signed-off-by: 0-day Robot <[email protected]>
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