fix Mime::NullType issue

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 4.3.1 (June 24, 2020)
+* [BUGFIX] Fix an issue in which `Mime::NullType` would result in an exception
+
 ## 4.3.0 (March 18, 2020)
 * [IMPROVEMENT] Fix Ruby 2.7 warnings
 * [IMPROVEMENT] Update Grape normalizer for version 1.3.1

SKYLIGHT_VERSION

@@ -1 +1 @@
-4.3.0
+4.3.1

lib/skylight/version.rb

@@ -1,3 +1,3 @@
 module Skylight
-  VERSION = "4.3.0".freeze
+  VERSION = "4.3.1".freeze
 end

skylight-core/lib/skylight/core/probes/action_controller.rb

@@ -27,6 +27,13 @@ def sk_rendered_mime
                 elsif respond_to?(:rendered_format) && rendered_format
                   rendered_format
                 end
+              rescue
+                # There are cases in which actionpack can return
+                # a stringified representation of a Mime::NullType instance,
+                # which is invalid for a number of reasons. This string raises
+                # errors when piped through Mime::Type.lookup, so it's probably
+                # best to just return nil in those cases.
+                nil
               end
           end
         end

skylight-core/lib/skylight/core/version.rb

@@ -1,5 +1,5 @@
 module Skylight
   module Core
-    VERSION = "4.3.0".freeze
+    VERSION = "4.3.1".freeze
   end
 end