Assign default values to `meta_map` hash if not present
Assign default values to `meta_map` hash if not present

Motejl/open-data-certificate,Motejl/open-data-certificate,zoul/open-data-certificate,theodi/open-data-certificate,theodi/open-data-certificate,ahmadassaf/open-data-certificate,theodi/open-data-certificate,istvan-antal/open-data-certificate,istvan-antal/open-data-certificate,ahmadassaf/open-data-certificate,zoul/open-data-certificate,zoul/open-data-certificate,zoul/open-data-certificate,ahmadassaf/open-data-certificate,ahmadassaf/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate,istvan-antal/open-data-certificate,Motejl/open-data-certificate