Layout adjustments for url preview

app/src/main/java/chat/rocket/android/chatroom/adapter/UrlPreviewViewHolder.kt

@@ -5,15 +5,21 @@ import android.net.Uri
 import android.view.View
 import chat.rocket.android.chatroom.viewmodel.UrlPreviewViewModel
 import chat.rocket.android.util.extensions.content
+import chat.rocket.android.util.extensions.setVisible
 import kotlinx.android.synthetic.main.message_url_preview.view.*
 
 class UrlPreviewViewHolder(itemView: View) : BaseViewHolder<UrlPreviewViewModel>(itemView) {
     override fun bindViews(data: UrlPreviewViewModel) {
         with(itemView) {
+            if (data.thumbUrl.isNullOrEmpty()) {
+                image_preview.setVisible(false)
+            } else {
                 image_preview.setImageURI(data.thumbUrl)
+                image_preview.setVisible(true)
+            }
             text_host.content = data.hostname
             text_title.content = data.title
-            text_description.content = data.description
+            text_description.content = data.description ?: ""
 
             url_preview_layout.setOnClickListener { view ->
                 view.context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(data.rawData.url)))