ENH : implement HasValue() method for OutputImageParamter

Code/Core/otbWrapperOutputImageParameter.cxx

@@ -56,6 +56,13 @@ OutputImageParameter::SetValue(VectorImageType* image)
   m_Image = image;
 }
 
+bool
+OutputImageParameter::HasValue() const
+{
+  std::string filename(this->GetFileName());
+  return !filename.empty();
+}
+
 }
 }
 

Code/Core/otbWrapperOutputImageParameter.h

@@ -59,6 +59,9 @@ public:
   /** Return any value */
   VectorImageType* GetValue( void );
 
+  /** Return true if a filename is set */
+  bool HasValue() const;
+
   itkSetStringMacro(FileName);
   itkGetStringMacro(FileName);
   itkGetObjectMacro(Writer, WriterType);