Fix #401: SD fails to start when using "load previous solution on startup" and the solution load fails with an unhandled exception.

src/Main/SharpDevelop/Workbench/WorkbenchStartup.cs

@@ -132,8 +132,12 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			// load previous solution
 			if (!didLoadSolutionOrFile && SD.PropertyService.Get("SharpDevelop.LoadPrevProjectOnStartup", false)) {
 				if (SD.FileService.RecentOpen.RecentProjects.Count > 0) {
-					SD.ProjectService.OpenSolutionOrProject(SD.FileService.RecentOpen.RecentProjects[0]);
-					didLoadSolutionOrFile = true;
+					try {
+						SD.ProjectService.OpenSolutionOrProject(SD.FileService.RecentOpen.RecentProjects[0]);
+						didLoadSolutionOrFile = true;
+					} catch (Exception ex) {
+						MessageService.ShowException(ex);
+					}
 				}
 			}