Fixed up base web test, removes RequiresDbSetup in place of new database behavior - NoDatabasePerFixture.

Fixed issue with another test... no idea how it didn't show up failing before.
Fixes issue with string extensions and an infinite loop when the string to strip is empty/null.

src/Umbraco.Tests/Routing/ContentFinderByPageIdQueryTests.cs

@@ -13,10 +13,10 @@ namespace Umbraco.Tests.Routing
 		/// <summary>
 		/// We don't need a db for this test, will run faster without one
 		/// </summary>
-		protected override bool RequiresDbSetup
-		{
-			get { return false; }
-		}
+        protected override DatabaseBehavior DatabaseTestBehavior
+        {
+            get { return DatabaseBehavior.NoDatabasePerFixture; }
+        }
 
 		[TestCase("/?umbPageId=1046", 1046)]
 		[TestCase("/?UMBPAGEID=1046", 1046)]