5.x - Fix type error when using control() outside of an open form.

[ndm2]

refs #391

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (61ae882) 99.37% compared to head (e884c92) 99.37%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #397   +/-   ##
=========================================
  Coverage     99.37%   99.37%           
- Complexity      369      370    +1     
=========================================
  Files            21       21           
  Lines          1276     1277    +1     
=========================================
+ Hits           1268     1269    +1     
  Misses            8        8           

Files	Coverage Δ
src/View/Helper/FormHelper.php	99.28% <100.00%> (+<0.01%)	⬆️

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