Add default value in InputGroupTrait.php

[umer936]

Description

Adds a default null value for templateVars in InputGroupTrait.php so

bootstrap-ui/src/View/Widget/InputGroupTrait.php

Line 83 in 6924ce4

'templateVars' => $data['templateVars'],

does not print a notice that it is missing.

Fixes #370

[codecov]

Codecov Report

Merging #372 (d6a767f) into master (86fc099) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #372   +/-   ##
=========================================
  Coverage     99.23%   99.23%           
  Complexity      369      369           
=========================================
  Files            21       21           
  Lines          1046     1046           
=========================================
  Hits           1038     1038           
  Misses            8        8           

Impacted Files	Coverage Δ
src/View/Widget/InputGroupTrait.php	96.77% <ø> (ø)

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[ndm2]

This should ideally have some small tests for the individual input type methods, similar to eg FormHelperTest::testAddOnPrependedText().

[ndm2]

ping @umer936 Can you add tests for it? If not, I can add some.

[umer936]

I can, but I think it would be quicker if you get to it bc (tbh) I don't use tests much 😅.
I need to work on making tests for things and then next time I submit a PR, I'll have the test(s) there.
Thanks :)