fix/Add section with no model

[ibelar]

Setting model is not need when adding a section with just a title only.

[codecov]

Codecov Report

Merging #745 into develop will increase coverage by 0.01%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #745      +/-   ##
=============================================
+ Coverage      66.03%   66.05%   +0.01%     
  Complexity      2223     2223              
=============================================
  Files            118      118              
  Lines           5235     5235              
=============================================
+ Hits            3457     3458       +1     
+ Misses          1778     1777       -1

Impacted Files	Coverage Δ	Complexity Δ
src/Card.php	62.61% <100%> (ø)	51 <0> (ø)	⬇️
src/TableColumn/Status.php	82.35% <0%> (+2.94%)	12% <0%> (ø)	⬇️

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