How to return only one variable in multi return function in GO? -

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hi have function want return docker.apicontainer , error (nil if no errors), in case of error should return in docker.apicontainer ?

this code 

func getcontainersrunningimage(imagename string, tag string) ([]docker.container,string) {    logfields := log.fields{         "handler": "get service",    }    client, err := docker.newtlsclient(sconf.dockconf.endpoint, sconf.dockconf.cert, sconf.dockconf.key, sconf.dockconf.ca)    if err != nil {       log.withfields(logfields).errorf("tlsclient not created: %s", err)       return _,err.error()    } }

what should add instead of _? obliged create var contarray []docker.container , return it? or there way

return nil, err.error()

goreturns automatically - 0 int , "" string etc.


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