binding queue should not throw excpetion if fails to connect (#542)

src/Microsoft.SqlTools.ServiceLayer/DisasterRecovery/RestoreOperation/RestoreDatabaseTaskDataObject.cs

@@ -316,6 +316,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery.RestoreOperation
             }
             catch(Exception ex)
             {
+                Logger.Write(LogLevel.Normal, $"Failed to execute restore task. error: {ex.Message}");
                 throw ex;
             }
             finally

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/ConnectedBindingQueue.cs

@@ -125,7 +125,14 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
             {
                 if (bindingContext.BindingLock.WaitOne(millisecondsTimeout))
                 {
-                    bindingContext.ServerConnection.Connect();
+                    try
+                    {
+                        bindingContext.ServerConnection.Connect();
+                    }
+                    catch
+                    {
+                        //TODO: remove the binding context? 
+                    }
                 }
             }
         }