Fix stuck when talking to npc seller (#1128)

* Fix zero length array check method

* Import grasscutter logger

src/main/java/emu/grasscutter/game/quest/GameQuest.java

@@ -2,6 +2,7 @@ package emu.grasscutter.game.quest;
 
 import dev.morphia.annotations.Entity;
 import dev.morphia.annotations.Transient;
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.data.GameData;
 import emu.grasscutter.data.binout.MainQuestData;
 import emu.grasscutter.data.binout.MainQuestData.SubQuestData;
@@ -44,11 +45,11 @@ public class GameQuest {
 		this.startTime = this.acceptTime;
 		this.state = QuestState.QUEST_STATE_UNFINISHED;
 		
-		if (questData.getFinishCond()!= null) {
+		if (questData.getFinishCond() != null && questData.getAcceptCond().length != 0) {
 			this.finishProgressList = new int[questData.getFinishCond().length];
 		}
 
-		if (questData.getFailCond() != null) {
+		if (questData.getFailCond() != null && questData.getFailCond().length != 0) {
 			this.failProgressList = new int[questData.getFailCond().length];
 		}
 		
@@ -165,7 +166,8 @@ public class GameQuest {
 				if (quest == null) {
 					QuestData questData = GameData.getQuestDataMap().get(subQuest.getSubId());
 
-					if (questData == null || questData.getAcceptCond() == null) {
+					if (questData == null || questData.getAcceptCond() == null
+							|| questData.getAcceptCond().length == 0) {
 						continue;
 					}
 
@@ -174,7 +176,8 @@ public class GameQuest {
 					// TODO
 					for (int i = 0; i < questData.getAcceptCond().length; i++) {
 						QuestCondition condition = questData.getAcceptCond()[i];
-						boolean result = getOwner().getServer().getQuestHandler().triggerCondition(this, condition, condition.getParam());
+						boolean result = getOwner().getServer().getQuestHandler().triggerCondition(this, condition,
+								condition.getParam());
 
 						accept[i] = result ? 1 : 0;
 					}
@@ -187,7 +190,7 @@ public class GameQuest {
 				}
 			}
 		} catch (Exception e) {
-			
+			Grasscutter.getLogger().error("An error occurred while trying to accept quest.", e);
 		}
 
 		return false;

src/main/java/emu/grasscutter/game/quest/QuestManager.java

 package emu.grasscutter.game.quest;
 
-import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.function.Consumer;
-import java.util.function.Function;
 
 import emu.grasscutter.data.GameData;
 import emu.grasscutter.data.excels.QuestData;
@@ -133,7 +130,9 @@ public class QuestManager {
 			QuestData data = quest.getData();
 			
 			for (int i = 0; i < data.getFinishCond().length; i++) {
-				if (quest.getFinishProgressList() == null || quest.getFinishProgressList()[i] == 1) {
+				if (quest.getFinishProgressList() == null 
+					|| quest.getFinishProgressList().length == 0
+					|| quest.getFinishProgressList()[i] == 1) {
 					continue;
 				}