fix: fix error when sort_var is not specified in tm_p_swimlane

Author: vedhav

R/tm_p_swimlane.R

@@ -79,7 +79,7 @@ tm_p_swimlane <- function(label = "Swimlane",
                           subject_var,
                           color_var,
                           group_var,
-                          sort_var = NULL,
+                          sort_var = time_var,
                           tooltip_vars = NULL,
                           point_size = 10,
                           point_colors = character(0),
@@ -160,7 +160,7 @@ srv_p_swimlane <- function(id,
                            subject_var,
                            color_var,
                            group_var,
-                           sort_var = time_var,
+                           sort_var,
                            point_size = 10,
                            point_colors,
                            point_symbols,