Fix dtype not existing with HDF5Loader

nabu/app/fullfield.py

@@ -753,7 +753,8 @@ class FullFieldPipeline:
         el = time() - t0
 
         shp = self.chunk_reader.data.shape
-        GB = np.prod(shp) * self.chunk_reader.dtype.itemsize / 1e9
+        itemsize = self.chunk_reader.dtype.itemsize if hasattr(self.chunk_reader, "dtype") else 4
+        GB = np.prod(shp) * itemsize / 1e9
         self.logger.info(
             "Read subvolume %s (%.2f GB) in %.2f s: %.3f GB/s"
             % (str(shp), GB, el, GB/el)