SC_FormParam をグローバルでインスタンス化すると E_WARNING が出力されるのを修正

[nanasess]

Fixes #1027
グローバルでインスタンス化した場合は class が含まれないため

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.94%. Comparing base (45ed754) to head (84330c5).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1111   +/-   ##
=======================================
  Coverage   49.94%   49.94%           
=======================================
  Files          82       82           
  Lines       10480    10480           
=======================================
  Hits         5234     5234           
  Misses       5246     5246           

Flag	Coverage Δ
tests	49.94% <100.00%> (ø)

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[seasoftjapan]

E_WARNING が2件減ることを確認した。

-2025/01/08 19:01:23 [/debug.php] Warning(E_WARNING): Undefined array key 1 on [/var/www/app/data/class/SC_FormParam.php(72)] from 192.168.144.1
-2025/01/08 19:01:23 [/debug.php] Warning(E_WARNING): Trying to access array offset on value of type null on [/var/www/app/data/class/SC_FormParam.php(72)] from 192.168.144.1

以下コードでクラス名と null を受け取れることを確認した。

        $objPlugin = SC_Helper_Plugin_Ex::getSingletonInstance();
        $objPlugin->arrRegistedPluginActions['SC_FormParam_construct'][] = [['function' => function ($class, $objFormParam) {
            var_dump($class);
        }]];
/* 結果
string(13) "LC_Page_Debug"
NULL
*/