Merge pull request #1532 from deepakverma/ServerSelectionStrategy

Don't set a default serverselection stratergy in case there was a fault getting the servertype

src/StackExchange.Redis/ConnectionMultiplexer.cs

@@ -1860,7 +1860,7 @@ internal async Task<bool> ReconfigureAsync(bool first, bool reconfigureAll, LogP
                         {
                             ServerSelectionStrategy.ServerType = ServerType.Sentinel;
                         }
-                        else
+                        else if (standaloneCount > 0)
                         {
                             ServerSelectionStrategy.ServerType = ServerType.Standalone;
                         }