Fixed SD2-673: Opening invalid projects raises exception

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@1074 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/Commands/FolderNodeCommands.cs

@@ -126,7 +126,7 @@ namespace ICSharpCode.SharpDevelop.Project.Commands
 			List<string> list = new List<string>();
 			StringParser.Properties["Extension"] = Path.GetExtension(fileName);
 			string prefix = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
-			foreach (string ext in AddInTree.BuildItems("/SharpDevelop/Workbench/DependentFileExtensions", null, true)) {
+			foreach (string ext in AddInTree.BuildItems("/SharpDevelop/Workbench/DependentFileExtensions", null, false)) {
 				if (File.Exists(prefix + ext))
 					list.Add(prefix + ext);
 			}

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/Commands/SolutionNodeCommands.cs

@@ -48,6 +48,7 @@ namespace ICSharpCode.SharpDevelop.Project.Commands
 		public static void AddProject(ISolutionFolderNode solutionFolderNode, string fileName)
 		{
 			IProject newProject = LanguageBindingService.LoadProject(fileName, Path.GetFileNameWithoutExtension(fileName));
+			if (newProject != null) {
 				newProject.Location = FileUtility.GetRelativePath(solutionFolderNode.Solution.Directory, fileName);
 				ParserService.CreateProjectContentForAddedProject(newProject);
 				solutionFolderNode.Container.AddFolder(newProject);
@@ -56,6 +57,7 @@ namespace ICSharpCode.SharpDevelop.Project.Commands
 				solutionFolderNode.Solution.ApplySolutionConfigurationToProjects();
 				solutionFolderNode.Solution.ApplySolutionPlatformToProjects();
 			}
+		}
 		
 		public override void Run()
 		{

src/Main/Base/Project/Src/Project/MissingProject.cs

@@ -28,6 +28,7 @@ namespace ICSharpCode.SharpDevelop.Project
 		{
 			Name     = Path.GetFileNameWithoutExtension(fileName);
 			FileName = fileName;
+			IdGuid = "{" + Guid.NewGuid().ToString() + "}";
 		}
 	}
 }

src/Main/Base/Project/Src/Project/UnknownProject.cs

@@ -28,6 +28,7 @@ namespace ICSharpCode.SharpDevelop.Project
 		{
 			Name     = Path.GetFileNameWithoutExtension(fileName);
 			FileName = fileName;
+			IdGuid = "{" + Guid.NewGuid().ToString() + "}";
 		}
 	}
 }