#18339: Isolating shells creation

Work Item: 18339

--HG--
branch : 1.x

src/Orchard/Environment/DefaultOrchardHost.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Linq;
 using System.Collections.Generic;
 
@@ -129,9 +130,14 @@ namespace Orchard.Environment {
             // load all tenants, and activate their shell
             if (allSettings.Any()) {
                 foreach (var settings in allSettings) {
+                    try {
                         var context = CreateShellContext(settings);
                         ActivateShell(context);
                     }
+                    catch(Exception e) {
+                        Logger.Error(e, "A tenant could not be started: " + settings.Name);
+                    }
+                }
             }
             // no settings, run the Setup
             else {