fix(composer): Fix a NPE in DataApiResponse

- Fix a NPE when `close()` is called on non-successful DataApiResponse instances.

Author: Georgi Neykov

composer/src/main/java/com/pcloud/networking/api/DataApiResponse.java

@@ -20,6 +20,8 @@
 
 import java.io.Closeable;
 
+import static com.pcloud.utils.IOUtils.closeQuietly;
+
 /**
  * An implementation to house the {@linkplain ResponseData} for the response of a network call
  *
@@ -53,7 +55,7 @@ public DataApiResponse(long resultCode, String message) {
      */
     final void setResponseData(ResponseData data) {
         if (this.responseData != null) {
-            throw new AssertionError("ResponseData already set to instance.");
+            throw new IllegalStateException("ResponseData already set to instance.");
         }
         this.responseData = data;
     }
@@ -69,6 +71,6 @@ public ResponseData responseData() {
 
     @Override
     public void close() {
-        responseData.close();
+        closeQuietly(responseData);
     }
 }