Remove null values in metadata

Author: AliSoftware

lib/fastlane/plugin/wpmreleasetoolkit/actions/ios/ios_send_app_size_metrics.rb

@@ -27,7 +27,7 @@ def self.run(params)
           plist['variants'].each do |_key, variant|
             variant_descriptors = variant['variantDescriptors'] || [{ 'device' => 'Universal' }]
             variant_descriptors.each do |desc|
-              variant_metadata = { device: desc['device'], 'OS Version': desc['os-version'] }
+              variant_metadata = { device: desc['device'], 'OS Version': desc['os-version'] }.compact
               payload.add_metric(name: 'Download Size', value: variant['sizeCompressedApp'], meta: variant_metadata)
               payload.add_metric(name: 'Install Size', value: variant['sizeUncompressedApp'], meta: variant_metadata)
             end