1) Try-catch block was added on a StepToTopoDS_TranslateEdgeLoop::Init() to
catch Standard_ConstructionError during the Curve conversion.
2) Checks of BSpline curve degree added to prevent construction error when converting edges to BSpline_Curve.
3) Warning message was added in case of incorrect curve definition.
Correct of the test cases according to the new error message added with fix
Conflicts:
tests/de/step_1/R9
Modified test cases according to new reference data