Fix crash when there's no response body.

build.gradle

@@ -43,7 +43,7 @@ signing {
 }
 
 group = 'rocks.kavin'
-version = '1.0.1'
+version = '1.0.2'
 sourceCompatibility = JavaVersion.VERSION_17
 targetCompatibility = JavaVersion.VERSION_17
 

reqwest-jni/src/lib.rs

@@ -80,7 +80,7 @@ pub extern "system" fn Java_rocks_kavin_reqwest4j_ReqwestUtils_fetch(
     let final_url = env.new_string(final_url).unwrap();
 
     let body = RUNTIME.block_on(async {
-        response.bytes().await.unwrap().to_vec()
+        response.bytes().await.unwrap_or_default().to_vec()
     });