Merge branch 'bugfix-matplotlib_back_compatibility' into 'develop'

Fix bug due to matplotlib backcompatibility

See merge request !27
12 jobs for develop in 28 minutes and 48 seconds (queued for 2 seconds)
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ubuntu sci docker
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  Ci
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osx-10.13 sci
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ubuntu sci docker
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ubuntu sci docker
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ubuntu sci docker
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windows-10 sci
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osx-10.13 sci
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ubuntu sci docker
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ubuntu sci docker
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ubuntu sci docker
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windows-10 sci
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  Docker Logout
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ubuntu sci docker
docker_logout

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