Anand Umashankar

Added changes from the recent commit concerning the bug in the initial_block

The same issue reoccurs on line #L286 as well in the same file. Check issue #474 and PR https://github.com/NVIDIA/MinkowskiEngine/pull/475

Clone the github repository and run `python setup.py install`

Same behavior in v0.42.1

@Jane333 @burui11087 @SHMCU @masoumeh1 @rishabh135 @flipflop98 Any update guys ? Thanks