Pierre Beitz

Do not fail if optional plugin cannot be retrieved

8

…f an optional plugin cannot be retrieved Swallow the `PluginNotFoundException` if the dependency is optional. Opening as a WIP PR, I'm not happy to have to do this this way...

### Version report Jenkins and plugins versions report: (FWIW version doesn't matter) ``` Jenkins: 2.249.3.1 OS: Mac OS X - 10.16 --- trilead-api:1.0.8 jdk-tool:1.4 command-launcher:1.4 script-security:1.75 echarts-api:4.9.0-1 structs:1.20 apache-httpcomponents-client-4-api:4.5.10-2.0 operations-center-server:2.249.0.8...

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### Testing done ```[tasklist] ### Submitter checklist - [ ] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch! - [ ] Ensure...

### Testing done ### Submitter checklist - [ ] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch! - [ ] Ensure that...