Copy raw description on long tap (fixes #6557)

app/src/main/java/eu/kanade/tachiyomi/widget/MangaSummaryView.kt

@@ -169,10 +169,12 @@ class MangaSummaryView @JvmOverloads constructor(
             minLines = DESC_MIN_LINES
 
             setOnLongClickListener {
+                description?.let {
                     context.copyToClipboard(
                         context.getString(R.string.description),
-                    text.toString()
+                        it.toString()
                     )
+                }
                 true
             }
         }