Account for possibly empty license_template_path
Account for possibly empty license_template_path

Don't attempt to load license_template if the path wasn't specified.

graydon/rust,aidancully/rust,rust-lang/rustfmt,SingingTree/rustfmt,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,SingingTree/rustfmt,graydon/rust,graydon/rust,aidancully/rust,rust-lang/rustfmt,aidancully/rust