Don't ignore errors in ReflectionLoader, show real exception instead of failing later with a ArgumentNullException.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@556 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Dom/ReflectionLayer/ReflectionLoader.cs

@@ -23,10 +23,12 @@ namespace ICSharpCode.SharpDevelop.Dom
 		{
 			try {
 				ReflectionProjectContent content = LoadProjectContent(fileName, include);
+				if (content == null)
+					return null;
 				return DomPersistence.SaveProjectContent(content);
 			} catch (Exception ex) {
 				LoggingService.Error(ex);
-				return null;
+				throw;
 			}
 		}
 		

src/Main/Base/Project/Src/Services/ParserService/ProjectContentRegistry.cs

@@ -158,11 +158,19 @@ namespace ICSharpCode.Core
 				object o = domain.CreateInstanceAndUnwrap(typeof(ReflectionLoader).Assembly.FullName, typeof(ReflectionLoader).FullName);
 				ReflectionLoader loader = (ReflectionLoader)o;
 				database = loader.LoadAndCreateDatabase(filename, include);
+			} catch (Exception e) {
+				database = null;
+				MessageService.ShowError(e);
 			} finally {
 				AppDomain.Unload(domain);
 			}
-			LoggingService.Debug("AppDomain finished, loading cache...");
-			return DomPersistence.LoadProjectContent(database);
+			if (database == null) {
+				LoggingService.Debug("AppDomain finished but returned null...");
+				return null;
+			} else {
+				LoggingService.Debug("AppDomain finished, loading cache...");
+				return DomPersistence.LoadProjectContent(database);
+			}
 		}
 		
 		static Assembly GetDefaultAssembly(string shortName)