Code linting: don't fail when there are no linkable changes

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## [Unreleased]
-*no unreleased changes*
+### Changed
+* Linting: return a zero exit status when there are no lintable changes (#97)
 
 ## 5.10.2 / 2021-02-15
 ### Fixed

lib/ndr_dev_support/rubocop/reporter.rb

@@ -22,15 +22,16 @@ def initialize(offenses)
       # Prints out a report, and returns an appriopriate
       # exit status for the rake task to terminate with.
       def report
-        if @offenses.any?
-          print_summary
-          puts
-          print_offenses
-          return @offenses.values.all?(&:empty?)
-        else
-          puts Rainbow('No relevant changes found.').yellow
-          return false
+        if @offenses.none?
+          warn Rainbow('No relevant changes found.').yellow
+          return true
         end
+
+        print_summary
+        puts
+        print_offenses
+
+        @offenses.values.all?(&:empty?)
       end
 
       private