Remove "try", because it is a rails feature

Also "&." is only available on ruby >= 2.3 (can be used later)

.rubocop.yml

@@ -190,6 +190,8 @@ Style/NumericPredicate:
 # only with ruby >= 2.3
 Style/FrozenStringLiteralComment:
   Enabled: false
+Style/SafeNavigation:
+  Enabled: false
 
 # only with ruby >= 2.4
 Performance/RegexpMatch:

lib/diaspora_federation/discovery/h_card.rb

@@ -269,7 +269,8 @@ module DiasporaFederation
       end
 
       private_class_method def self.content_from_doc(doc, content_selector)
-        element_from_doc(doc, content_selector).try(:content)
+        element = element_from_doc(doc, content_selector)
+        element.content if element
       end
 
       private_class_method def self.photo_from_doc(doc, photo_selector)

lib/diaspora_federation/entities/relayable.rb

@@ -72,7 +72,7 @@ module DiasporaFederation
       # @param [Hash] additional_xml_elements additional xml elements
       # @see DiasporaFederation::Entity#initialize
       def initialize(data, xml_order=nil, additional_xml_elements={})
-        @xml_order = xml_order.try(:reject) {|name| name =~ /signature/ }
+        @xml_order = xml_order.reject {|name| name =~ /signature/ } if xml_order
         @additional_xml_elements = additional_xml_elements
 
         super(data)