Prevent PropertyContainer from failing when there is no workbench (in unit tests)

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2466 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Gui/Pads/PropertyPad/PropertyContainer.cs

@@ -40,8 +40,10 @@ namespace ICSharpCode.SharpDevelop.Gui
 		/// </summary>
 		public PropertyContainer()
 		{
-			PadDescriptor desc = WorkbenchSingleton.Workbench.GetPad(typeof(PropertyPad));
-			if (desc != null) desc.CreatePad();
+			if (WorkbenchSingleton.Workbench != null) {
+				PadDescriptor desc = WorkbenchSingleton.Workbench.GetPad(typeof(PropertyPad));
+				if (desc != null) desc.CreatePad();
+			}
 		}
 		
 		object selectedObject;

src/Main/Base/Project/Src/Gui/WorkbenchSingleton.cs

@@ -19,7 +19,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 		const string workbenchMemento        = "WorkbenchMemento";
 		
 		static STAThreadCaller caller;
-		static DefaultWorkbench workbench    = null;
+		static DefaultWorkbench workbench;
 		
 		public static Form MainForm {
 			get {
@@ -27,6 +27,9 @@ namespace ICSharpCode.SharpDevelop.Gui
 			}
 		}
 		
+		/// <summary>
+		/// Gets the workbench. Returns null in unit-testing mode.
+		/// </summary>
 		public static IWorkbench Workbench {
 			get {
 				return workbench;