Make the validator component optional, even using the ParamFetcher without requirements, Fix #717
 Failed to locate a schema at location #685 #739 The Tests are red/failure in windows since v1.2. Solve.
 Failed to locate a schema at location #685 #739 The Tests are red/failure in windows since v1.2. Solve. Spaces removed.
Merge pull request #744 from fabricek/pr/pr-685-739

 Failed to locate a schema at location #685 #739 The Tests are red/failu...
Merge pull request #737 from ClementGautier/patch-optional-validator

Make the validator component optional