Hotfix for variable number of states

[antoine-dedieu]

Fixing two minor issues when running BP with variable groups defined with different number of states

[codecov-commenter]

Codecov Report

Merging #144 (4ecdd02) into master (1570a1f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #144   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines          949       949           
=========================================
  Hits           949       949           

Impacted Files	Coverage Δ
pgmax/vgroup/varray.py	100.00% <ø> (ø)
pgmax/__init__.py	100.00% <100.00%> (ø)
pgmax/vgroup/vdict.py	100.00% <100.00%> (ø)

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[StannisZhou]

Could you also add a simple unit test that would catch this earlier, and bump up the version for another release?

[StannisZhou]

LGTM. Thanks for fixing!