trace: Fix panic calling trace without arg
trace: Fix panic calling trace without arg

alexbrainman/delve,derekparker/delve,aarzilli/delve,alexbrainman/delve,go-delve/delve,dr2chase/delve,aarzilli/delve,dlsniper/delve,aarzilli/delve,go-delve/delve,dr2chase/delve,aarzilli/delve,go-delve/delve,dlsniper/delve,visualfc/delve,derekparker/delve,visualfc/delve,visualfc/delve,go-delve/delve,dlsniper/delve,go-delve/delve,ggndnn/delve,ggndnn/delve,dr2chase/delve,alexbrainman/delve,ggndnn/delve,derekparker/delve