Fix a bug where meta was only added when series name was specified
Fix a bug where meta was only added when series name was specified

hansmaad/chartist-js,gionkunz/chartist-js,cr3ative/chartist-js,chartist-js/chartist,gionkunz/chartist-js,cr3ative/chartist-js,chartist-js/chartist,chartist-js/chartist,hansmaad/chartist-js