Merge branch 'pp_test_key_error' into 'master'

Use dict's getter in `get_all_injection_credible_levels`

See merge request !560
6 jobs for master in 6 minutes and 50 seconds (queued for 4 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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passed #392784
python-2.7

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passed #392785
python-3.7

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  Deploy
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pages

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