🐛 remove empty team names, ignore NA/na

* This will help catch configuration issues that may be introduced by humans
* This also inserts an opinion that may be adjusted later- that NA and
  na are not valid team names... This is to account for the fact that
  existing users were using this name in their configuration files to
  cause the sync bot to "skip" the team, even though under the covers
  the sync bot would fail (before).

source/Gttsb.Gh/Bootstrap.cs

@@ -43,13 +43,16 @@ public static async Task<bool> StartTeamSyncAsync(IActiveDirectoryFacade activeD
 
             var org = gitHubFacade.OrgName;            
 
-            var groupsToSyncronize = groupDisplayNames.Select(g => new
-            {
-                Key = g.Key,
-                Value = new TeamDefinition("ActiveDirectory", g.Key)
-            }).ToDictionary(o => o.Key, o => o.Value);
+            var groupsToSyncronize = groupDisplayNames.Where(n => !string.IsNullOrWhiteSpace(n.Key))                
+                .Where(n => !(n.Key == "NA" || n.Key == "na"))
+                .Select(g => new
+                {
+                    Key = g.Key,
+                    Value = new TeamDefinition("ActiveDirectory", g.Key)
+                })
+                .ToDictionary(o => o.Key, o => o.Value);
 
-            Console.WriteLine("This Action will attempt to syncronize the following groups:");
+            Console.WriteLine("The sync tool will attempt to syncronize the following groups:");
             foreach (var group in groupsToSyncronize)
             {
                 Console.WriteLine($"* {group.Key}");