rerun: fix rp_visualization TypeError (#33749)

* Fixed iteration over liveTracks in radar visualization by ensuring the data structure is iterable and made the background black

* Requested changes, moved conditional to function call

* Simplified conditional, renamed method

tools/replay/lib/rp_helpers.py

@@ -8,7 +8,8 @@
                      (230, "vibrantpink", (255, 36, 170)),
                      (240, "orange", (255, 146, 0)),
                      (255, "white", (255, 255, 255)),
-                     (110, "carColor", (255,0,127))]
+                     (110, "carColor", (255,0,127)),
+                     (0, "background", (0, 0, 0))]
 
 
 class UIParams:
@@ -68,7 +69,7 @@ def plot_lead(rs, lid_overlay):
     lid_overlay[px_left:px_right, py] = rerunColorPalette[0][0]
 
 
-def maybe_update_radar_points(lt, lid_overlay):
+def update_radar_points(lt, lid_overlay):
   ar_pts = []
   if lt is not None:
     ar_pts = {}

tools/replay/rp_visualization.py

@@ -8,7 +8,7 @@
 from openpilot.common.basedir import BASEDIR
 from openpilot.tools.replay.lib.rp_helpers import (UP, rerunColorPalette,
                                          get_blank_lid_overlay,
-                                         maybe_update_radar_points, plot_lead,
+                                         update_radar_points, plot_lead,
                                          plot_model)
 from msgq.visionipc import VisionIpcClient, VisionStreamType
 
@@ -33,7 +33,8 @@ def visualize(addr):
     if sm.recv_frame['radarState']:
       plot_lead(sm['radarState'], lid_overlay)
     liveTracksTime = sm.logMonoTime['liveTracks']
-    maybe_update_radar_points(sm['liveTracks'], lid_overlay)
+    if sm.updated['liveTracks']:
+      update_radar_points(sm['liveTracks'], lid_overlay)
     rr.set_time_nanos("TIMELINE", liveTracksTime)
     rr.log("tracks", rr.SegmentationImage(np.flip(np.rot90(lid_overlay, k=-1), axis=1)))