Avoid try-catch for predictable exception

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33843 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for Tangent[point,spline]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33844 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e