fix(team): Prevent null dereference in TeamFactory::createTeam

[sentry]

This PR addresses CLIENT-38X by adding a null check in TeamFactory::createTeam before calling t->setActive().

Previously, createInactiveTeam(name) could return nullptr if the specified team prototype did not exist. TeamFactory::createTeam would then unconditionally attempt to call setActive() on this null pointer, leading to a fatal EXCEPTION_ACCESS_VIOLATION_READ crash.

The fix introduces a check: if createInactiveTeam returns nullptr, createTeam now safely returns nullptr as well. Callers of createTeam are already designed to handle a null return value, ensuring robust behavior.

Changes were applied to:

• Generals/Code/GameEngine/Source/Common/RTS/Team.cpp
• GeneralsMD/Code/GameEngine/Source/Common/RTS/Team.cpp

Fixes CLIENT-38X

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