CInfClassCharacter::Tick: Ignore the tick if Class is not set

Fix a crash.

src/game/server/infclass/entities/infccharacter.cpp

@@ -175,16 +175,17 @@ void CInfClassCharacter::Destroy()
 
 void CInfClassCharacter::Tick()
 {
-	const vec2 PrevPos = m_Core.m_Pos;
-	const int CurrentTick = Server()->Tick();
-
-	if(m_pClass)
+	if(!m_pClass)
 	{
-		// On the very first tick of a new round when the Reset is not complete yet,
-		// The character can (still) be in a special zone while still have no class assigned.
-		GameController()->HandleCharacterTiles(this);
+		// Sometimes m_pClass is still nullptr on the very first tick
+		// of a new round when the Reset is not complete yet.
+		return;
 	}
 
+	const vec2 PrevPos = m_Core.m_Pos;
+	const int CurrentTick = Server()->Tick();
+	GameController()->HandleCharacterTiles(this);
+
 	CCharacter::Tick();
 
 	if(m_BlindnessTicks > 0)
@@ -225,10 +226,7 @@ void CInfClassCharacter::Tick()
 		--m_LastHelper.m_Tick;
 	}
 
-	if(m_pClass)
-	{
-		m_pClass->OnCharacterTick();
-	}
+	m_pClass->OnCharacterTick();
 }
 
 void CInfClassCharacter::TickDeferred()