* Sketcher: Handle exceptions in onViewValueChanged
Because the method onViewValueChanged is used as a Qt slot it must handle all possibly raised exceptions as otherwise
they will slip through GUIApplication::notify() that usually results into a crash on some platforms like macOS
* Sketch: Handle undefined values in calculateThroughPointMinorAxisParameters
* The argument of acos() must be in the range [-1, +1], otherwise it returns nan (not a number)
* The value of sin(0) = 0. So, it cannot be used in the denominator of a fraction
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