Check for common number of bins once

Framework/Algorithms/src/MaxEnt.cpp

@@ -222,8 +222,9 @@ void MaxEnt::exec() {
   MatrixWorkspace_const_sptr inWS = getProperty("InputWorkspace");
   // Number of spectra
   size_t nspec = inWS->getNumberHistograms();
-  // Number of data points - assumed to be constant between spectra
-  size_t npoints = inWS->y(0).size() * resolutionFactor;
+  // Number of data points - assumed to be constant between spectra or
+  // this will throw an exception
+  size_t npoints = inWS->y(0).blocksize() * resolutionFactor;
   // Number of X bins
   const size_t npointsX = inWS->isHistogramData() ? npoints + 1 : npoints;