Gracefully deserialize the media_details.sizes property as array when it's empty

Author: hichamboushaba

fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpapi/media/MediaWPRestResponse.kt

@@ -6,6 +6,7 @@ import com.google.gson.annotations.SerializedName
 import org.apache.commons.text.StringEscapeUtils
 import org.wordpress.android.fluxc.model.MediaModel
 import org.wordpress.android.fluxc.model.MediaModel.MediaUploadState
+import org.wordpress.android.fluxc.network.rest.JsonObjectOrEmptyArray
 import org.wordpress.android.fluxc.network.rest.wpcom.media.MediaWPComRestResponse
 import org.wordpress.android.util.DateTimeUtils
 import java.text.SimpleDateFormat
@@ -45,7 +46,7 @@ data class MediaWPRESTResponse(
         val medium: ImageSize?,
         val thumbnail: ImageSize?,
         val full: ImageSize?
-    )
+    ): JsonObjectOrEmptyArray()
 
     data class ImageSize(
         val path: String?,