Remove unnecessary empty group parameter from redirect URLs

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

api.go

@@ -91,7 +91,13 @@ func (srv *RttyServer) ListenAPI() error {
 				return
 			}
 
-			c.Redirect(http.StatusFound, "/rtty/"+devid+"?group="+group)
+			url := "/rtty/" + devid
+
+			if group != "" {
+				url += "?group=" + group
+			}
+
+			c.Redirect(http.StatusFound, url)
 			return
 		}
 		handleUserConnection(srv, c)

ui/src/views/Home.vue

@@ -155,7 +155,10 @@ export default {
       this.selection = selection
     },
     connectDevice(devid) {
-      window.open(`/rtty/${devid}?group=${this.group}`)
+      let url = `/rtty/${devid}`
+      if (this.group)
+        url += `?group=${this.group}`
+      window.open(url)
     },
     connectDeviceWeb(dev) {
       this.$refs.rttyWeb.show(dev)