Fix bug with change author and projects with no members

app/helpers/additionals_issues_helper.rb

@@ -2,6 +2,8 @@ module AdditionalsIssuesHelper
   def issue_author_options_for_select(project, issue = nil)
     authors = project.users.sorted
     s = []
+    return s unless authors.any?
+
     s << content_tag('option', "<< #{l(:label_me)} >>", value: User.current.id) if authors.include?(User.current)
 
     if issue.nil?

app/views/issues/_change_author.html.slim

@@ -1,5 +1,7 @@
 - if show_issue_change_author?(issue) && issue.safe_attribute?('author_id')
-  p#change_author
-    = form.select :author_id, issue_author_options_for_select(issue.project, issue), required: true
-  javascript:
-    $('#change_author').insertBefore($('#issue_tracker_id').parent());
+  - author_options = issue_author_options_for_select(issue.project, issue)
+  - if author_options.present?
+    p#change_author
+      = form.select :author_id, author_options, required: true
+    javascript:
+      $('#change_author').insertBefore($('#issue_tracker_id').parent());

app/views/issues/_change_author_bulk.html.slim

@@ -1,5 +1,7 @@
 - if @project && User.current.allowed_to?(:edit_issue_author, @project)
-  p#change_author
-    = label_tag('issue[author_id]', l(:field_author))
-    = select_tag('issue[author_id]',
-                 content_tag('option', l(:label_no_change_option), value: '') + issue_author_options_for_select(@project))
+  - author_options = issue_author_options_for_select(@project)
+  - if author_options.present?
+    p#change_author
+      = label_tag('issue[author_id]', l(:field_author))
+      = select_tag('issue[author_id]',
+                   content_tag('option', l(:label_no_change_option), value: '') + author_options)