Merge branch 'private-beta' into develop

Tusker/Screens/Compose/ComposeAttachmentsViewController.swift

@@ -75,6 +75,15 @@ class ComposeAttachmentsViewController: UITableViewController {
         tableView.dragInteractionEnabled = true
         tableView.dragDelegate = self
         tableView.dropDelegate = self
+        
+        if mastodonController.instance == nil {
+            mastodonController.getOwnInstance { [weak self] (_) in
+                guard let self = self else { return }
+                DispatchQueue.main.async {
+                    self.updateAddAttachmentsButtonEnabled()
+                }
+            }
+        }
     }
     
     override func viewWillAppear(_ animated: Bool) {
@@ -98,7 +107,9 @@ class ComposeAttachmentsViewController: UITableViewController {
     }
     
     private func isAddAttachmentsButtonEnabled() -> Bool {
-        switch mastodonController.instance.instanceType {
+        switch mastodonController.instance?.instanceType {
+        case nil:
+            return false
         case .pleroma:
             return true
         case .mastodon: