Fix pip when no one else is in the call

Author: Imperiopolis

Signal/Signal-Info.plist

@@ -7,7 +7,7 @@
 		<key>OSXVersion</key>
 		<string>10.15.7</string>
 		<key>WebRTCCommit</key>
-		<string>5479e22bf635262239cf4f2f530af14734db76b8 Production build of v2.8.7</string>
+		<string>d9faa1be9ef6996232977b0ee713efa024c0df9d Production build of v2.8.8</string>
 	</dict>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>

Signal/src/Calls/UserInterface/Group/GroupCallMemberView.swift

@@ -387,6 +387,18 @@ class GroupCallRemoteMemberView: GroupCallMemberView {
         }
     }
 
+    func clearConfiguration() {
+        deferredReconfigTimer?.invalidate()
+
+        cleanupVideoViews()
+
+        noVideoView.backgroundColor = .ows_black
+        backgroundAvatarView.image = nil
+        avatarView.image = nil
+
+        [errorView, spinner, muteIndicatorImage].forEach { $0.isHidden = true }
+    }
+
     private func updateDimensions() {
         guard hasBeenConfigured else { return }
         videoView?.frame = bounds

Signal/src/Calls/UserInterface/Group/GroupCallViewController.swift

@@ -350,6 +350,8 @@ class GroupCallViewController: UIViewController {
                 call: call,
                 device: speakerState
             )
+        } else {
+            speakerView.clearConfiguration()
         }
 
         // Setting the speakerphone before we join the call will fail,