Fixed SD2-939

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@1594 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Services/NavigationService/NavigationService.cs

@@ -125,7 +125,8 @@ namespace ICSharpCode.Core
 		private static void LogInternal(INavigationPoint p)
 		{
 			if (p == null
-			    || p.FileName==null) { // HACK: why/how do we get here?
+			    || p.FileName==null			   // HACK: why/how do we get here?
+			    || p.FileName==String.Empty) { // HACK: why/how do we get here?
 				return;
 			}
 			if (currentNode==null) {

src/Main/Base/Test/Services_Navigation/NavigationServiceTestFixture.cs

@@ -572,6 +572,22 @@ namespace NavigationServiceTests
 			Assert.IsTrue(NavigationService.CanNavigateForwards);
 		}
 		
+		[Test]
+		/// <summary>
+		/// Addresses <see cref="http://bugtracker.sharpdevelop.net/Default.aspx?p=4&i=939">SD2-939</see>: 
+		/// Code Navigate Back dropdown first menu has a blank filename
+		/// </summary>
+		public void IgnoreBlankFilenamesTest()
+		{
+			Assert.AreEqual(0, NavigationService.Count);
+			
+			INavigationPoint testPoint = new TestNavigationPoint(String.Empty);
+			Assert.AreEqual(String.Empty, testPoint.FileName);
+			
+			NavigationService.Log(testPoint);
+			Assert.AreEqual(0, NavigationService.Count);
+		}
+		
 		#region setup / tear down
 		
 		[SetUp]