Fixed crash when parsing incomplete Imports statement.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.0@1353 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Project/Src/Parser/VBNet/Parser.cs

@@ -379,7 +379,7 @@ ref val);
 out u);
 
 #line  537 "VBNET.ATG" 
-		usings.Add(u); 
+		if (u != null) { usings.Add(u); } 
 		while (la.kind == 12) {
 			lexer.NextToken();
 			ImportClause(
@@ -387,7 +387,7 @@ out u);
 out u);
 
 #line  539 "VBNET.ATG" 
-			usings.Add(u); 
+			if (u != null) { usings.Add(u); } 
 		}
 		EndOfStmt();
 

src/Libraries/NRefactory/Project/Src/Parser/VBNet/VBNET.ATG

@@ -534,9 +534,9 @@ ImportsStmt
 		Point startPos = t.Location;
 		Using u;
 	.)
-	ImportClause<out u> (. usings.Add(u); .)
+	ImportClause<out u> (. if (u != null) { usings.Add(u); } .)
 	{
-		"," ImportClause<out u> (. usings.Add(u); .)
+		"," ImportClause<out u> (. if (u != null) { usings.Add(u); } .)
 	}
 	EndOfStmt
 	(.

src/Libraries/NRefactory/Test/Parser/GlobalScope/UsingDeclarationTests.cs

@@ -107,7 +107,25 @@ namespace ICSharpCode.NRefactory.Tests.AST
 			IParser parser = ParserFactory.CreateParser(SupportedLanguage.VBNet, new StringReader(program));
 			parser.Parse();
 			Assert.IsTrue(parser.Errors.count > 0);
+			UsingDeclaration u = (UsingDeclaration)parser.CompilationUnit.Children[0];
+			foreach (Using us in u.Usings) {
+				Assert.IsNotNull(us);
+			}
 		}
+		
+		[Test]
+		public void VBNetWrongUsing2Test()
+		{
+			string program = "Imports ,\n";
+			IParser parser = ParserFactory.CreateParser(SupportedLanguage.VBNet, new StringReader(program));
+			parser.Parse();
+			Assert.IsTrue(parser.Errors.count > 0);
+			UsingDeclaration u = (UsingDeclaration)parser.CompilationUnit.Children[0];
+			foreach (Using us in u.Usings) {
+				Assert.IsNotNull(us);
+			}
+		}
+		
 		[Test]
 		public void VBNetDeclarationTest()
 		{