ENH: expose method to check if SVM model has probability estimates

Modules/Learning/SVMLearning/include/otbSVMModel.h

@@ -307,6 +307,12 @@ public:
     return static_cast<bool>(m_Parameters.probability);
   }
 
+  /** Test if the model has probabilities */
+  bool HasProbabilities(void) const
+    {
+    return static_cast<bool>(svm_check_probability_model(m_Model));
+    }
+
   /** Return number of support vectors */
   int GetNumberOfSupportVectors(void) const
   {

Modules/Learning/SVMLearning/include/otbSVMModel.txx

@@ -464,7 +464,7 @@ SVMModel<TValue, TLabel>::EvaluateProbabilities(const MeasurementType& measure)
     itkExceptionMacro(<< "Model is not up-to-date, can not predict probabilities");
     }
 
-  if (svm_check_probability_model(m_Model) == 0)
+  if (!this->HasProbabilities())
     {
     throw itk::ExceptionObject(__FILE__, __LINE__,
                                "Model does not support probability estimates", ITK_LOCATION);