Print clear CMake error if six python module is not installed
Print clear CMake error if six python module is not installed

StalderT/open62541,StalderT/open62541,StalderT/open62541,jpfr/open62541,open62541/open62541,StalderT/open62541,JGrothoff/open62541,open62541/open62541,JGrothoff/open62541,JGrothoff/open62541,open62541/open62541,JGrothoff/open62541,jpfr/open62541,jpfr/open62541,jpfr/open62541,open62541/open62541