MSS crashes occasionally when moving a point in TopView

[Joern Ungermann]

MSS crashed when moving a waypoint in TopView. The error is not easily reproducable. Error log attached. The root cause isn't obvious, but the error could be mitigated.

Log file of crash is attached.

[Reimar Bauer]

Add an exception to catch strange error in moving points in TopView

Under unknown circumstances that could not be reproduced, the Table was updated by point moving with an object that generated a "TypeError" when passing it to a "float()" function. To prevent a crash from MSS, that error is now captured at the appropriate places and an error is dumped to the log, which might help in finding the root cause.

Fix issue #238

→ <<cset 2ae85722ad20>>