On Thursday with the help of my friends field test was done to see if the bug of adding a dummy waypoint to the end of the flight plan is fixed. We started with modified Arduplane 2.65 with the flight plan

QGC WPL 110
0 1 0 16 0 0 0 0 21.062670 105.797165 15.000000 1
1 0 3 16 0.000000 0.000000 0.000000 0.000000 21.063156 105.796065 50.000000 1
2 0 3 16 0.000000 0.000000 0.000000 0.000000 21.063126 105.798581 50.000000 1
3 0 3 16 0.000000 0.000000 0.000000 0.000000 21.061359 105.798619 50.000000 1
4 0 3 16 0.000000 0.000000 0.000000 0.000000 21.061344 105.796076 50.000000 1
5 0 3 177 1.000000 1.000000 0.000000 0.000000 0.000000 0.000000 0.000000 1

You can see that there's no dummy waypoint at the end. The test was succeeded, the plane flied twice above waypoints, then loitered over home. So I would say the bug is fixed. The change was done only in process_next_command() in command_process.ino. Here I include the file command_process.ino so that anyone can test with other flight plans.