Fix number_to_human(0) exception [#5532 state:resolved]

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

actionpack/lib/action_view/helpers/number_helper.rb

@@ -459,7 +459,8 @@ def number_to_human(number, options = {})
           raise ArgumentError, ":units must be a Hash or String translation scope."
         end.keys.map{|e_name| DECIMAL_UNITS.invert[e_name] }.sort_by{|e| -e}
 
-        number_exponent = Math.log10(number).floor
+        number_exponent = 0
+        number_exponent = Math.log10(number).floor if number != 0
         display_exponent = unit_exponents.find{|e| number_exponent >= e }
         number  /= 10 ** display_exponent
 

actionpack/test/template/number_helper_test.rb

@@ -184,6 +184,7 @@ def test_number_to_human_size_with_custom_delimiter_and_separator
   end
 
   def test_number_to_human
+     assert_equal '0', number_to_human(0)
      assert_equal '123', number_to_human(123)
      assert_equal '1.23 Thousand', number_to_human(1234)
      assert_equal '12.3 Thousand', number_to_human(12345)