fixes #226, and closes #228

fixup

fx

lib/github_changelog_generator/generator/generator.rb

@@ -119,7 +119,7 @@ module GitHubChangelogGenerator
     # @param [Array] issues
     # @return [String] generated log for issues
     def issues_to_log(issues)
-      log ""
+      log = ""
       bugs_a, enhancement_a, issues_a = parse_by_sections(issues)
 
       log += generate_sub_section(enhancement_a, @options[:enhancement_prefix])

lib/github_changelog_generator/generator/generator_generation.rb

@@ -139,7 +139,7 @@ module GitHubChangelogGenerator
 
     def generate_unreleased_section
       log = ""
-      if @options[:unreleased] && @all_tags.count != 0
+      if @options[:unreleased]
         unreleased_log = generate_log_between_tags(all_tags[0], nil)
         log += unreleased_log if unreleased_log
       end

lib/github_changelog_generator/generator/generator_processor.rb

@@ -69,7 +69,8 @@ module GitHubChangelogGenerator
     # @param [String] newer_tag all issue after this tag will be excluded. May be nil for unreleased section
     # @return [Array] filtered issues
     def delete_by_time(array, hash_key = :actual_date, older_tag = nil, newer_tag = nil)
-      fail ChangelogGeneratorError, "At least one of the tags should be not nil!".red if older_tag.nil? && newer_tag.nil?
+      # in case if not tags specified - return unchanged array
+      return array if older_tag.nil? && newer_tag.nil?
 
       newer_tag_time = newer_tag && @fetcher.get_time_of_tag(newer_tag)
       older_tag_time = older_tag && @fetcher.get_time_of_tag(older_tag)
@@ -124,16 +125,17 @@ module GitHubChangelogGenerator
         issues_wo_labels = issues.select do |issue|
           !issue.labels.map(&:name).any?
         end
-        issues_wo_labels
+        return issues_wo_labels
       end
       []
     end
 
     def filter_by_include_labels(issues)
-      @options[:include_labels].nil? ? issues : issues.select do |issue|
+      filtered_issues = @options[:include_labels].nil? ? issues : issues.select do |issue|
         labels = issue.labels.map(&:name) & @options[:include_labels]
         (labels).any?
       end
+      filtered_issues
     end
 
     # Return tags after filtering tags in lists provided by option: --between-tags & --exclude-tags