null checks

src/Console/Program.cs

@@ -821,7 +821,7 @@ namespace Bit.Console
                 if(result.Success)
                 {
                     WriteSuccessLine(string.Format("Syncing complete ({0} users, {1} groups).",
-                        result.Users.Count, result.Groups.Count));
+                        result.Users?.Count ?? 0, result.Groups?.Count ?? 0));
                 }
                 else
                 {
@@ -855,22 +855,30 @@ namespace Bit.Console
                 var result = await Sync.SyncAllAsync(force, false);
                 if(result.Success)
                 {
-                    Con.WriteLine("Groups:");
-                    foreach(var group in result.Groups)
+                    if(result.Groups != null)
                     {
-                        Con.WriteLine("  {0} - {1}", group.Name, group.ExternalId);
-                        foreach(var user in group.UserMemberExternalIds)
+                        Con.WriteLine("Groups:");
+
+                        foreach(var group in result.Groups)
                         {
-                            Con.WriteLine("    {0}", user);
+                            Con.WriteLine("  {0} - {1}", group.Name, group.ExternalId);
+                            foreach(var user in group.UserMemberExternalIds)
+                            {
+                                Con.WriteLine("    {0}", user);
+                            }
                         }
                     }
 
-                    Con.WriteLine();
-                    Con.WriteLine("Users:");
-                    foreach(var user in result.Users)
+                    if(result.Users != null)
                     {
-                        Con.WriteLine("  {0}{1}{2}", user.Email ?? user.ExternalId,
-                            user.Disabled ? " (-)" : null, user.Deleted ? " (X)" : null);
+                        Con.WriteLine();
+                        Con.WriteLine("Users:");
+
+                        foreach(var user in result.Users)
+                        {
+                            Con.WriteLine("  {0}{1}{2}", user.Email ?? user.ExternalId,
+                                user.Disabled ? " (-)" : null, user.Deleted ? " (X)" : null);
+                        }
                     }
                 }
                 else

src/Core/Models/ImportRequest.cs

@@ -8,8 +8,8 @@ namespace Bit.Core.Models
     {
         public ImportRequest(List<GroupEntry> groups, List<UserEntry> users)
         {
-            Groups = groups.Select(g => new Group(g)).ToArray();
-            Users = users.Select(u => new User(u)).ToArray();
+            Groups = groups?.Select(g => new Group(g)).ToArray() ?? new Group[] { };
+            Users = users?.Select(u => new User(u)).ToArray() ?? new User[] { };
         }
 
         public Group[] Groups { get; set; }

src/Core/Utilities/Sync.cs

@@ -24,14 +24,17 @@ namespace Bit.Core.Utilities
                 var groups = entriesResult.Item1;
                 var users = entriesResult.Item2;
 
-                FlattenUsersToGroups(groups, null, groups);
+                if(groups?.Any() ?? false)
+                {
+                    FlattenUsersToGroups(groups, null, groups);
+                }
 
                 if(!sendToServer)
                 {
                     RestoreDeltas(startingGroupDelta, startingUserDelta);
                 }
 
-                if(!sendToServer || (groups.Count == 0 && users.Count == 0))
+                if(!sendToServer || ((groups?.Count ?? 0) == 0 && (users?.Count ?? 0) == 0))
                 {
                     return new SyncResult
                     {

src/Service/Service.cs

@@ -100,7 +100,7 @@ namespace Service
                 sw.Stop();
                 if(result.Success)
                 {
-                    _eventLog.WriteEntry($"Synced {result.Groups.Count} groups, {result.Users.Count} users. " +
+                    _eventLog.WriteEntry($"Synced {result.Groups?.Count ?? 0} groups, {result.Users?.Count ?? 0} users. " +
                         $"The sync took {(int)sw.Elapsed.TotalSeconds} seconds to complete.",
                         EventLogEntryType.SuccessAudit);
                 }