enhance: show git errors when failed to get the repository root dir of given path (#397)

src/Commands/QueryRepositoryRootPath.cs

@@ -6,15 +6,6 @@
         {
             WorkingDirectory = path;
             Args = "rev-parse --show-toplevel";
-            RaiseError = false;
-        }
-
-        public string Result()
-        {
-            var rs = ReadToEnd().StdOut;
-            if (string.IsNullOrEmpty(rs))
-                return null;
-            return rs.Trim();
         }
     }
 }