Avoid final empty block creation when file size is greater than block size.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/retrieve_executor.py

@@ -191,16 +191,14 @@ class RetrieveExecutor(TaskExecutor):
                 #self.totalSize += fileSize
                 # check if the file is larger than a block size
                 if fileSize > self.maxBlockSize:
-                    # if the current block is not empty, "close" it, otherwise
-                    # use it and then create a new block
+                    # if the current block is not empty, "close" it,
+                    # otherwise use it
                     if blockSize > 0:
                         blockIdx += 1
                         fileInfo["blockIdx"] = blockIdx
-                        blockIdx += 1
                     else:
                         fileInfo["blockIdx"] = blockIdx
-                        blockIdx += 1
-                    blockSize = 0
+                    blockSize = self.maxBlockSize
                 else:
                     # the file can be contained by a block, so check if
                     # the file size plus the current block fill is lower