Fix pointcloud2 display divide by 0 (ros2#1581) (ros2#1583)

(cherry picked from commit f4f2851)

Co-authored-by: Antonio Brandi <[email protected]>

Author: mergify[bot]

rviz_default_plugins/src/rviz_default_plugins/displays/pointcloud/point_cloud2_display.cpp

@@ -104,7 +104,11 @@ sensor_msgs::msg::PointCloud2::ConstSharedPtr PointCloud2Display::filterOutInval
   filtered->header = cloud->header;
   filtered->fields = cloud->fields;
   filtered->height = 1;
-  filtered->width = static_cast<uint32_t>(filtered->data.size() / cloud->point_step);
+  if (cloud->point_step > 0) {
+    filtered->width = static_cast<uint32_t>(filtered->data.size() / cloud->point_step);
+  } else {
+    filtered->width = 0;
+  }
   filtered->is_bigendian = cloud->is_bigendian;
   filtered->point_step = cloud->point_step;
   filtered->row_step = filtered->width;