Fix crash loading game with Search missile

Source/loadsave.cpp

@@ -2532,7 +2532,7 @@ void LoadGame(bool firstflag)
 		}
 	}
 
-	missiles_process_charge();
+	SetUpMissileAnimationData();
 	RedoMissileFlags();
 	NewCursor(CURSOR_HAND);
 	gbProcessPlayers = IsDiabloAlive(!firstflag);

Source/missiles.cpp

@@ -4175,13 +4175,17 @@ void ProcessMissiles()
 	DeleteMissiles();
 }
 
-void missiles_process_charge()
+void SetUpMissileAnimationData()
 {
 	for (auto &missile : Missiles) {
-		missile._miAnimData = GetMissileSpriteData(missile._miAnimType).spritesForDirection(missile._mimfnum);
-		if (missile._mitype != MissileID::Rhino)
+		if (missile._miAnimType == MissileGraphicID::None)
 			continue;
 
+		if (missile._mitype != MissileID::Rhino) {
+			missile._miAnimData = GetMissileSpriteData(missile._miAnimType).spritesForDirection(missile._mimfnum);
+			continue;
+		}
+
 		const CMonster &mon = Monsters[missile._misource].type();
 
 		MonsterGraphic graphic;

Source/missiles.h

@@ -454,7 +454,7 @@ void ProcessBoneSpirit(Missile &missile);
 void ProcessResurrectBeam(Missile &missile);
 void ProcessRedPortal(Missile &missile);
 void ProcessMissiles();
-void missiles_process_charge();
+void SetUpMissileAnimationData();
 void RedoMissileFlags();
 
 #ifdef BUILD_TESTING