improve output (#517)

Author: MarcoRossignoli

src/coverlet.console/Program.cs

@@ -1,9 +1,10 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.IO;
 using System.Text;
-using System.Threading.Tasks;
+
 using ConsoleTables;
 using Coverlet.Console.Logging;
 using Coverlet.Core;
@@ -240,6 +241,11 @@ static int Main(string[] args)
                 app.ShowHelp();
                 return (int)CommandExitCodes.CommandParsingException;
             }
+            catch (Win32Exception we) when (we.Source == "System.Diagnostics.Process")
+            {
+                logger.LogError($"Start process '{target.Value()}' failed with '{we.Message}'");
+                return exitCode > 0 ? exitCode : (int)CommandExitCodes.Exception;
+            }
             catch (Exception ex)
             {
                 logger.LogError(ex.Message);