try/catch the git graph dump

Author: asbjornu

src/GitVersionExe/Program.cs

@@ -98,9 +98,17 @@ static int VerifyArgumentsAndRun()
                 if (arguments != null)
                 {
                     Logger.WriteInfo(string.Empty);
-                    Logger.WriteInfo("Here is the current git graph (please include in issue): ");
+                    Logger.WriteInfo("Attempting to show the current git graph (please include in issue): ");
                     Logger.WriteInfo("Showing max of 100 commits");
-                    GitTools.LibGitExtensions.DumpGraph(arguments.TargetPath, Logger.WriteInfo, 100);
+
+                    try
+                    {
+                        GitTools.LibGitExtensions.DumpGraph(arguments.TargetPath, Logger.WriteInfo, 100);
+                    }
+                    catch (Exception dumpGraphException)
+                    {
+                        Logger.WriteError("Couldn't dump the git graph due to the following error: " + dumpGraphException);
+                    }
                 }
                 return 1;
             }