Send column error message to dev-null due to "column" version in Ubuntu

[mrbitsdcf]

Due to column command version in Ubuntu 18.04, that doesn't have the --help option, lambda-functions returns the followingo error:

After the error, lambda functions are listed.

To avoid this it is just a matter to send column errors to /dev/null when the test to determine $column_command is done. After the changes, lambda-functions works fine:

[mbailey]

Thanks! Merging.