Eliminate test coverage requirement for this exception handling code

Author: kpaulisse

lib/octocatalog-diff/util/util.rb

@@ -27,7 +27,9 @@ def self.object_is_any_of?(object, classes)
       def self.safe_dup(object)
         object.dup
       rescue TypeError
+        # :nocov:
         object
+        # :nocov:
       end
 
       # Utility Method!