From 26c1f71ce453d55fda442252dac9fbd544a14547 Mon Sep 17 00:00:00 2001
From: Isaiah Norton <isaiah.norton@gmail.com>
Date: Fri, 2 Mar 2018 12:25:31 -0500
Subject: [PATCH] BUG: prevent crash when TransformFileReader transform list is
 empty

---
 .../IO/TransformBase/include/itkTransformFileReader.hxx   | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Modules/IO/TransformBase/include/itkTransformFileReader.hxx b/Modules/IO/TransformBase/include/itkTransformFileReader.hxx
index aed80096528..35da14f3c5f 100644
--- a/Modules/IO/TransformBase/include/itkTransformFileReader.hxx
+++ b/Modules/IO/TransformBase/include/itkTransformFileReader.hxx
@@ -139,6 +139,14 @@ void TransformFileReaderTemplate<TParametersValueType>
   m_TransformIO->SetFileName(m_FileName);
   m_TransformIO->Read();
 
+  if (ioTransformList.empty())
+    {
+    std::ostringstream msg;
+    msg <<  "Transform IO: " << m_TransformIO->GetNameOfClass() << std::endl
+        <<  "   failed to read file: " << this->GetFileName() << std::endl;
+    itkExceptionMacro( << msg.str() );
+    }
+
   // Clear old results.
   this->m_TransformList.clear();
   // If the transform is derived from itk::KernelTransform, the internal matrices