Fix save draft sheet showing even when draft had no content

Tusker/Screens/Compose/ComposeView.swift

@@ -145,7 +145,13 @@ struct ComposeView: View {
             // draft is already stored in drafts manager, drafts manager is saved by ComposeHostingController.viewWillDisappear
             uiState.delegate?.dismissCompose()
         } else {
+            // if the draft doesn't have content, it doesn't need to be saved
+            if draft.hasContent {
                 uiState.isShowingSaveDraftSheet = true
+            } else {
+                DraftsManager.shared.remove(draft)
+                uiState.delegate?.dismissCompose()
+            }
         }
     }