cleaning up robocop warnings

lib/cocoapods/command/repo/push.rb

@@ -39,10 +39,7 @@ module Pod
           @allow_warnings = argv.flag?('allow-warnings')
           @local_only = argv.flag?('local-only')
           @repo = argv.shift_argument
-          begin
-            @source = config.sources_manager.source_with_name_or_url(@repo) unless @repo.nil?
-          rescue
-          end
+          @source = source_for_repo
           @source_urls = argv.option('sources', config.sources_manager.all.map(&:url).join(',')).split(',')
           @podspec = argv.shift_argument
           @use_frameworks = !argv.flag?('use-libraries')
@@ -246,6 +243,18 @@ module Pod
           podspec_files.count
         end
 
+        # Returns source for @repo
+        #
+        # @note If URL is invalid or repo doesn't exist, validate! will throw the error
+        #
+        # @return [Source]
+        #
+        def source_for_repo
+          config.sources_manager.source_with_name_or_url(@repo) unless @repo.nil?
+        rescue
+          nil
+        end
+
         #---------------------------------------------------------------------#
       end
     end