IDetector::applyDetectorResolution sort blocks

Device/Detector/IDetector.cpp

@@ -157,12 +157,12 @@ void IDetector::setResolutionFunction(const IResolutionFunction2D& resFunc)
 
 void IDetector::applyDetectorResolution(Datafield* intensity_map) const
 {
-    if (!m_resolution)
-        return;
-
     ASSERT(intensity_map);
 
+    if (!m_resolution)
+        return;
     m_resolution->applyDetectorResolution(intensity_map);
+
     if (detectorMask() && detectorMask()->hasMasks()) {
         // sets amplitude in masked areas to zero
         auto buff = std::make_unique<Datafield>(intensity_map->frame().clone());