ENH: Set environment in try/finally
ENH: Set environment in try/finally

To avoid situations in wich the flag is not unset

tomMoral/joblib,lesteve/joblib,tomMoral/joblib,aabadie/joblib,karandesai-96/joblib,joblib/joblib,lesteve/joblib,aabadie/joblib,karandesai-96/joblib,joblib/joblib