Update OStatus2 to handle malformed Salmon without raising unexpected exceptions

Gemfile.lock

@@ -166,12 +166,11 @@ GEM
     minitest (5.9.0)
     multi_json (1.12.1)
     nio4r (1.2.1)
-    nokogiri (1.6.8)
+    nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
     oj (2.17.3)
     orm_adapter (0.5.0)
-    ostatus2 (0.3.1)
+    ostatus2 (0.3.2)
       addressable (~> 2.4)
       http (~> 2.0)
       nokogiri (~> 1.6)
@@ -187,7 +186,6 @@ GEM
     parser (2.3.1.2)
       ast (~> 2.2)
     pg (0.18.4)
-    pkg-config (1.1.7)
     powerpack (0.1.1)
     pry (0.10.4)
       coderay (~> 1.1.0)

app/services/process_interaction_service.rb

@@ -35,7 +35,7 @@ class ProcessInteractionService < BaseService
         delete_post!(xml, account)
       end
     end
-  rescue Goldfinger::Error, HTTP::Error
+  rescue Goldfinger::Error, HTTP::Error, OStatus2::BadSalmonError
     nil
   end