Fix load_config failure in command and repl use

[micahjsmith]

Fixes #72

[codecov-commenter]

Codecov Report

Merging #73 (9698037) into master (6710d88) will decrease coverage by 0.49%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   84.87%   84.38%   -0.50%     
==========================================
  Files          47       47              
  Lines        2751     2753       +2     
  Branches      280      281       +1     
==========================================
- Hits         2335     2323      -12     
- Misses        327      341      +14     
  Partials       89       89              

Impacted Files	Coverage Δ
ballet/project.py	87.24% <100.00%> (+0.17%)	⬆️
ballet/compat.py	27.27% <0.00%> (-42.43%)	⬇️

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