Make GetHtmlSource more prone to bad data from libgnomeui
Check all users of GetHtmlSource and make them work as expected

http://bugzilla.gnome.org/show_bug.cgi?id=165629

Index: Tiles/TileFile.cs
===================================================================
RCS file: /cvs/gnome/beagle/Tiles/TileFile.cs,v
retrieving revision 1.22
diff -u -B -p -r1.22 TileFile.cs
--- Tiles/TileFile.cs	17 Mar 2005 14:26:35 -0000	1.22
+++ Tiles/TileFile.cs	18 Mar 2005 23:41:20 -0000
@@ -59,12 +59,13 @@ namespace Beagle.Tile {
 			Gtk.IconSize size = (Gtk.IconSize) 48;
 			string path = BU.GnomeIconLookup.LookupMimeIcon (Hit.MimeType,
 									 size);
-			if (path != null && path != "") {
-				Template["Icon"] = Images.GetHtmlSource (path,
-									 BU.GnomeIconLookup.GetFileMimeType (path));
-			} else {	
+			string icon = Images.GetHtmlSource (path,
+								 BU.GnomeIconLookup.GetFileMimeType (path));
+
+			if (icon != null)
+				Template["Icon"] = icon;
+			else
 				Template ["Icon"] = Images.GetHtmlSource ("document", "image/png");
-			}
 		}
 
 		[TileAction]
Index: Tiles/TileLauncher.cs
===================================================================
RCS file: /cvs/gnome/beagle/Tiles/TileLauncher.cs,v
retrieving revision 1.5
diff -u -B -p -r1.5 TileLauncher.cs
--- Tiles/TileLauncher.cs	13 Mar 2005 04:37:36 -0000	1.5
+++ Tiles/TileLauncher.cs	18 Mar 2005 23:41:20 -0000
@@ -85,8 +85,12 @@ namespace Beagle.Tile {
 		protected override void PopulateTemplate ()
 		{
 			base.PopulateTemplate ();
+			String icon = Images.GetHtmlSource (ImagePath (), Hit.MimeType);
 
-			Template["Icon"] = Images.GetHtmlSource (ImagePath (), Hit.MimeType);
+			if (icon != null)
+				Template["Icon"] = icon;
+			else
+				Template["Icon"] = Images.GetHtmlSource ("document", "image/png");
 
 		}
 
Index: images/Images.cs
===================================================================
RCS file: /cvs/gnome/beagle/images/Images.cs,v
retrieving revision 1.10
diff -u -B -p -r1.10 Images.cs
--- images/Images.cs	1 Mar 2005 13:47:55 -0000	1.10
+++ images/Images.cs	18 Mar 2005 23:41:20 -0000
@@ -140,7 +140,7 @@ namespace Beagle {
 		static public string GetHtmlSource (string name, 
 						    string mime_type) 
 		{
-			if (name == null) {
+			if (name == null || name.Length == 0) {
 				return null;
 			} else if (name.StartsWith ("file://")) {
 				return name;
@@ -156,6 +156,8 @@ namespace Beagle {
 				// since they'll probably be repeated a lot
 
 				stream = GetStream (name);
+				if (stream == null)
+					return null;
 
 				byte[] binary_data = new Byte[stream.Length];
 				long bytes_read = stream.Read(binary_data, 0,