fixing errors with bundle file conditional statement

Author: Dave Try

lib/puppet/provider/docker_stack/ruby.rb

@@ -14,11 +14,10 @@ def exists?
     stack_containers = []
     resource[:compose_files].each do |file|
       compose_file = YAML.safe_load(File.read(file), [], [], true)
-      # rubocop:disable Style/StringLiterals
       containers = docker([
                             'ps',
                             '--format',
-                            "{{.Label \"com.docker.swarm.service.name\"}}-{{.Image}}",
+                            '{{.Label "com.docker.swarm.service.name"}}-{{.Image}}',
                             '--filter',
                             "label=com.docker.stack.namespace=#{name}",
                           ]).split("\n").each do |c|
@@ -78,8 +77,7 @@ def destroy
   end
 
   def bundle_file
-    return unless resource[:bundle_file].nil?
-    resource[:bundle_file].map { |x| ['-c', x] }.flatten
+    return resource[:bundle_file].map { |x| ['-c', x] }.flatten unless resource[:bundle_file].nil?
   end
 
   def compose_files