(GitToolsGH-495) Allow milestones without issues

Author: Jericho

src/GitReleaseManager.Core/Configuration/Config.cs

@@ -27,6 +27,7 @@ public Config()
                 ShaSectionHeading = "SHA256 Hashes of the release artifacts",
                 ShaSectionLineFormat = "- `{1}\t{0}`",
                 AllowUpdateToPublishedRelease = false,
+                AllowMilestonesWithoutIssues = false,
             };
 
             Export = new ExportConfig

src/GitReleaseManager.Core/Configuration/CreateConfig.cs

@@ -34,5 +34,8 @@ public class CreateConfig
 
         [YamlMember(Alias = "allow-update-to-published")]
         public bool AllowUpdateToPublishedRelease { get; set; }
+
+        [YamlMember(Alias = "allow-milestone-without-issues")]
+        public bool AllowMilestonesWithoutIssues { get; set; }
     }
 }

src/GitReleaseManager.Core/ReleaseNotes/ReleaseNotesBuilder.cs

@@ -58,7 +58,7 @@ public async Task<string> BuildReleaseNotesAsync(string user, string repository,
 
             var numberOfCommits = await _vcsProvider.GetCommitsCountAsync(_user, _repository, @base, head).ConfigureAwait(false);
 
-            if (issues.Count == 0)
+            if (issues.Count == 0 && !_configuration.Create.AllowMilestonesWithoutIssues)
             {
                 var logMessage = string.Format(CultureInfo.CurrentCulture, "No closed issues have been found for milestone {0}, or all assigned issues are meant to be excluded from release notes, aborting release creation.", _milestoneTitle);
                 throw new InvalidOperationException(logMessage);