Merge pull request #3047 from csouls/rafactor_array_ruby_extension

Remove redundant conditions of Array#each in ruby extension

mrblib/array.rb

@@ -15,10 +15,8 @@ class Array
     idx, length = -1, self.length-1
     while idx < length and length <= self.length and length = self.length-1
       elm = self[idx += 1]
-      unless elm
-        if elm.nil? and length >= self.length
-          break
-        end
+      if elm.nil? and length >= self.length
+        break
       end
       block.call(elm)
     end