Solve completion issue

Author: jcs090218

Server/Buffer.cs

@@ -34,6 +34,9 @@ public string GetWordAtPosition(Position position)
 
             string[] words = GetWords(lineStr);
 
+            if (words.Length == 0)
+                return null;
+
             int currentColumn = 0;
 
             string on = words[0];

Server/Handlers/SignatureHelpHandler.cs

@@ -111,7 +111,7 @@ private SignatureInformation CreateSignature(string sign, string documentation)
 
                     var newPararm = new ParameterInformation()
                     {
-                        Documentation = "",
+                        Documentation = "some doc",
                         Label = param
                     };