print available coverages when referencing missing coverage in seed conf
print available coverages when referencing missing coverage in seed conf

vrsource/mapproxy,Anderson0026/mapproxy,drnextgis/mapproxy,faegi/mapproxy,Anderson0026/mapproxy,faegi/mapproxy,camptocamp/mapproxy,kaiCu/mapproxy,kaiCu/mapproxy,camptocamp/mapproxy,geoadmin/mapproxy,procrastinatio/mapproxy,mapproxy/mapproxy,geoadmin/mapproxy,olt/mapproxy,procrastinatio/mapproxy,mapproxy/mapproxy,vrsource/mapproxy,drnextgis/mapproxy,olt/mapproxy