Fix Bug in sol_component_value_edge

[ccoffrin]

closes #811

[codecov]

Codecov Report

Merging #812 (0077e12) into master (797008d) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #812      +/-   ##
==========================================
+ Coverage   93.89%   93.91%   +0.02%     
==========================================
  Files          42       42              
  Lines        9873     9873              
==========================================
+ Hits         9270     9272       +2     
+ Misses        603      601       -2     

Impacted Files	Coverage Δ
src/core/solution.jl	81.25% <100.00%> (+12.50%)	⬆️
src/core/variable.jl	96.64% <100.00%> (ø)
src/form/dcp.jl	97.18% <100.00%> (ø)
src/form/iv.jl	92.57% <100.00%> (ø)

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