Fix if with nullable inverse subscriptions

[Brajk19]

fixes #97

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.95%. Comparing base (a14ef9b) to head (ab0ed81).
Report is 1 commits behind head on 1.x.

Additional details and impacted files

@@            Coverage Diff            @@
##                1.x      #98   +/-   ##
=========================================
  Coverage     96.94%   96.95%           
  Complexity      487      487           
=========================================
  Files            62       62           
  Lines          1442     1444    +2     
=========================================
+ Hits           1398     1400    +2     
  Misses           44       44           

Flag	Coverage Δ
8.1	96.95% <100.00%> (+<0.01%)	⬆️
8.2	96.87% <100.00%> (+<0.01%)	⬆️
8.3	96.87% <100.00%> (+<0.01%)	⬆️
8.4	96.87% <100.00%> (+<0.01%)	⬆️

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