Avoid PHP warnings about undefined array keys when sanitizing malformed PEMs#556

Spomky merged 2 commits intoweb-token:3.4.xweb-token/jwt-framework:3.4.xfrom

crocodele:fix/AvoidUndefinedIndexWarningcrocodele/jwt-framework:fix/AvoidUndefinedIndexWarningCopy head branch name to clipboard