Fixes #609

- Also addresses a typo where the cipher key was checked to exist twice.

Signal/src/environment/VersionMigrations.m

@@ -101,7 +101,6 @@
     }
 }
 
-
 +(BOOL)wasRedPhoneRegistered{
     BOOL hasLocalNumber    = [UICKeyChainStore stringForKey:LOCAL_NUMBER_KEY]!=nil;
     BOOL hasPassKey        = [UICKeyChainStore stringForKey:SAVED_PASSWORD_KEY]!=nil;
@@ -113,7 +112,7 @@
     BOOL registered = [[NSUserDefaults.standardUserDefaults objectForKey:@"isRegistered"] boolValue];
     
     return registered && hasLocalNumber && hasPassKey && hasSignaling
-    && hasCipherKey && hasCipherKey && hasZIDKey && hasSignalingExtra;
+    && hasCipherKey && hasZIDKey && hasSignalingExtra;
 }
 
 + (void)migrateKeyingStorageToVersion2Dot0{

Signal/src/view controllers/MessagesViewController.m

@@ -355,9 +355,11 @@ typedef enum : NSUInteger {
     
     self.navController = (APNavigationController*)self.navigationController;
     
-    if(!isGroupConversation) {
+    if([self canCall]) {
         self.navigationItem.rightBarButtonItem =  [[UIBarButtonItem alloc] initWithImage:[[UIImage imageNamed:@"btnPhone--white"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] style:UIBarButtonItemStylePlain target:self action:@selector(callAction)];
         self.navigationItem.rightBarButtonItem.imageInsets = UIEdgeInsetsMake(0, -10, 0, 10);
+    } else if(!_thread.isGroupThread) {
+        self.navigationItem.rightBarButtonItem = nil;
     }
     
     [self hideInputIfNeeded];