Fixes HasContent if there is actually no content (new install).

Fixes issue with TreeDefinitionCollection not initializing when accessing singleton... not sure how i overlooked that before. This fixes
issues with MNTP initialization and probably some other tree stuff.
Removes warning log in umbracomodule for not a document as this just takes up space in the log.
Fixes issue with logger that was logging 'Info' for our internal Debug calls.

src/Umbraco.Web/DefaultPublishedContentStore.cs

@@ -161,7 +161,10 @@ namespace Umbraco.Web
 
         public bool HasContent(UmbracoContext umbracoContext)
         {
-			var node = GetXml(umbracoContext).SelectSingleNode(XPathStrings.RootDocuments);
+	        var xml = GetXml(umbracoContext);
+			if (xml == null)
+				return false;
+			var node = xml.SelectSingleNode(XPathStrings.RootDocuments);
 			return node != null;
         }
 

src/Umbraco.Web/UmbracoModule.cs

@@ -271,10 +271,11 @@ namespace Umbraco.Web
 			if (maybeDoc && GlobalSettings.IsReservedPathOrUrl(lpath))
 				maybeDoc = false;
 
-			if (!maybeDoc)
-			{
-				LogHelper.Warn<UmbracoModule>("Not a document");
-			}
+			//NOTE: No need to warn, plus if we do we should log the document, as this message doesn't really tell us anything :)
+			//if (!maybeDoc)
+			//{
+			//	LogHelper.Warn<UmbracoModule>("Not a document");
+			//}
 
 			return maybeDoc;
 		}

src/Umbraco.Web/umbraco.presentation/umbraco/Trees/TreeDefinitionCollection.cs

@@ -33,6 +33,7 @@ namespace umbraco.cms.presentation.Trees
         {
             get 
             {
+				instance.EnsureTreesRegistered();
                 return instance; 
             }
         }