Replace abort in log tensor by zero tensor

Common/itkLogTensorImageFilter.txx

@@ -50,7 +50,7 @@ namespace itk
 	}
 	catch( itk::ExceptionObject &)
 	{
-	  throw itk::ExceptionObject(__FILE__,__LINE__,"Error in LogTensorImageFilter::ThreadedGenerateData()");
+          T.Fill(0);
 	}
       }      
       itOut.Set (T);