avoid duplicate blocks

[arpruss]

Here is a patch to avoid duplicate blocks.

[imonari]

An alternative for "better splitting of data lines" commit can be:

Original code:

if line[0] == '#' : continue
line = line.strip().split(' ')

New code:

if (line[0] == '#') or (line.isspace()) : continue   # comment or empty line
line = line.split()

It can be changed in minecraft-renderObjv.py and minecraft-renderObjv2.py.