Fix a parse bug with a quoted line with col_sep and an empty line

GitHub: fix GH-324

This is introduced by bb93c28.

We can't reuse `row` in this case because `row` is used for the next
row.

Reported by stoodfarback. Thanks!!!

Author: kou

lib/csv/parser.rb

@@ -1041,7 +1041,7 @@ def parse_quotable_robust(&block)
           quoted_fields << @quoted_column_value
         elsif parse_row_end
           if row.empty? and value.nil?
-            emit_row(row, &block) unless @skip_blanks
+            emit_row([], &block) unless @skip_blanks
           else
             row << value
             quoted_fields << @quoted_column_value

test/csv/parse/test_general.rb

@@ -322,6 +322,15 @@ def test_seeked_string_io
                  CSV.new(input_with_bom).each.to_a)
   end
 
+  def test_quoted_col_sep_and_empty_line
+    assert_equal([["one,"], [], ["three"]],
+                 CSV.parse(<<-CSV))
+"one,"
+
+"three"
+                 CSV
+  end
+
   private
 
   {