Fix Layout/EmptyLineAfterGuardClause offenses

```
rubocop --only Layout/EmptyLineAfterGuardClause -a
```

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/axlsx/workbook/worksheet/protected_ranges.rb b/lib/axlsx/workbook/worksheet/protected_ranges.rb
index d16dbbd6..aa627315 100644
--- a/lib/axlsx/workbook/worksheet/protected_ranges.rb
+++ b/lib/axlsx/workbook/worksheet/protected_ranges.rb
@@ -6,6 +6,7 @@ module Axlsx
 
     def initialize(worksheet)
       raise ArgumentError, 'You must provide a worksheet' unless worksheet.is_a?(Worksheet)
+
       super ProtectedRange
       @worksheet = worksheet
     end
@@ -27,6 +28,7 @@ module Axlsx
     # @return [String]
     def to_xml_string(str = '')
       return if empty?
+
       str << '<protectedRanges>'
       each { |range| range.to_xml_string(str) }
       str << '</protectedRanges>'