Merge branch 'pp_test_key_error' into 'master'

Use dict's getter in `get_all_injection_credible_levels`

See merge request !560
7 jobs for master in 21 minutes and 35 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
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basic-2.7

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basic-3.7

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python-2.7

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passed #392822
python-3.7

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passed #392823
scheduled-python-3.7

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  Deploy
passed #392824
pages

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passed pages:deploy

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