Exception after several starts and stops of same component

[LANDAISB]

Use case:

• start a component A, with some componentServices
• start a component B, which uses component A Services: OK
• stop B: OK
• start B: OK
• stop B: OK
• start B -> Exception (see image below):

[LabordePierre]

Thanks @LANDAISB, this issue is related to #241

[LabordePierre]

Another problem: when a producer is removed, the default key is not the default one but nil. This is a functional problem, need to introduce a (small) regression. The solution: when a producer is removed, stay the default component name. In the future, if it's not necessary for us to have this default behavior, we can add a method to the component that configures it.