QoL changes

src/main/java/emu/grasscutter/game/drop/DropManager.java

@@ -53,8 +53,7 @@ public class DropManager {
                 Grasscutter.getLogger().error("Unable to load drop data. Drop data size is 0.");
             }
         } catch (Exception e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
+            Grasscutter.getLogger().error("Unable to load drop data.", e);
         }
     }
     private void addDropEntity(DropData dd, Scene dropScene, ItemData itemData, Position pos, int num, Player target) {

src/main/java/emu/grasscutter/game/shop/ShopManager.java

@@ -85,8 +85,7 @@ public class ShopManager {
 				});
 			}
 		} catch (Exception e) {
-			// TODO Auto-generated catch block
-			e.printStackTrace();
+			Grasscutter.getLogger().error("Unable to load shop data.", e);
 		}
 	}
 

src/main/java/emu/grasscutter/server/dispatch/DispatchHttpJsonHandler.java

 package emu.grasscutter.server.dispatch;
 
 import java.io.IOException;
-import java.io.OutputStream;
 import java.util.Arrays;
-import java.util.Collections;
 
-import com.sun.net.httpserver.HttpExchange;
-import com.sun.net.httpserver.HttpHandler;
 import emu.grasscutter.Grasscutter;
 import express.http.HttpContextHandler;
 import express.http.Request;