Fix crash when special power template is null

[seer-by-sentry]

Fixes CLIENT-2WP. The issue was that: ControlBar::processCommandUI dereferences a null SpecialPowerTemplate pointer from a CommandButton without validation, causing an access violation.

• Added a null check for 'spTemplate' before dereferencing it.
• Prevents a potential crash if 'commandButton->getSpecialPowerTemplate()' returns null during special power command processing.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 12403189

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[github-actions]

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