Generate the spline in case it is not already generated in the evaluate() function.

src/g2_spline.cpp

@@ -865,6 +865,8 @@ void CG2Spline::generate(double &resolution,double n1,double n2, double n3, doub
 
 bool CG2Spline::evaluate(double length, TPoint& point)
 {
+  if(!this->generated)
+    this->generate(DEFAULT_RESOLUTION);
   if (length < -this->resolution || length > (this->length[this->num_points-1]+this->resolution))
     return false;
   else if(length<0.0)