Fix empty string comparison issues in the codebase (#16686)

Automatic Merge

api4/command.go

@@ -216,7 +216,7 @@ func listCommands(c *Context, w http.ResponseWriter, r *http.Request) {
 	customOnly, _ := strconv.ParseBool(r.URL.Query().Get("custom_only"))
 
 	teamId := r.URL.Query().Get("team_id")
-	if len(teamId) == 0 {
+	if teamId == "" {
 		c.SetInvalidParam("team_id")
 		return
 	}