deserialize UUID support input empty string, for issue alibaba#1763

core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java

@@ -5378,6 +5378,9 @@ public final UUID readUUID() {
         }
 
         String str = readString();
+        if (str.isEmpty()) {
+            return null;
+        }
         return UUID.fromString(str);
     }
 

core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF8.java

@@ -7993,6 +7993,9 @@ public final UUID readUUID() {
         }
 
         String str = readString();
+        if (str.isEmpty()) {
+            return null;
+        }
         return UUID.fromString(str);
     }
 

core/src/test/java/com/alibaba/fastjson2/issues_1700/Issue1763.java

@@ -0,0 +1,18 @@
+package com.alibaba.fastjson2.issues_1700;
+
+import com.alibaba.fastjson2.JSON;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+public class Issue1763 {
+    @Test
+    public void test() {
+        String str = "\"\"";
+        assertNull(JSON.parseObject(str, UUID.class));
+        assertNull(JSON.parseObject(str.toCharArray(), UUID.class));
+        assertNull(JSON.parseObject(str.getBytes(), UUID.class));
+    }
+}