* Src/Lexer/AbstractLexer.cs: Added null check.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3867 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Project/Src/Lexer/AbstractLexer.cs

@@ -48,11 +48,13 @@ namespace ICSharpCode.NRefactory.Parser
 		
 		protected static IEnumerable<string> GetSymbols (string symbols)
 		{
-			foreach (string symbol in symbols.Split (';')) {
-				string s = symbol.Trim ();
-				if (s.Length == 0)
-					continue;
-				yield return s;
+			if (!string.IsNullOrEmpty(symbols)) {
+				foreach (string symbol in symbols.Split (';')) {
+					string s = symbol.Trim ();
+					if (s.Length == 0)
+						continue;
+					yield return s;
+				}
 			}
 		}