Log error message when racer can't provide navigation

Author: vosen

VisualRust/RustGoToDefinitionCommandHandler.cs

@@ -89,6 +89,10 @@ protected override bool Execute(VSConstants.VSStd97CmdID command, uint options,
                     }
                     return true;
                 }
+                else
+                {
+                    Utils.PrintToOutput(findOutput);
+                }
 
             }
             return false;

VisualRust/Utils.cs

@@ -262,7 +262,7 @@ internal static void PrintToOutput(string s, params object[] args)
             IVsOutputWindowPane pane;
             ErrorHandler.ThrowOnFailure(outWindow.CreatePane(paneGuid, "General", 1, 0));            
             outWindow.GetPane(ref paneGuid, out pane);
-            pane.OutputString(string.Format("[VisualRust]: " + s, args) + "\n");
+            pane.OutputString(string.Format("[Visual Rust]: " + s, args));
             pane.Activate();
         }