Counting the Blanks Too

A school survey asks pupils for their favourite lunch. Some pupils skip the question, and a skipped answer is stored as None.

The head wants a share for every answer, including the skipped ones. That way the shares add up to the whole year group, and nobody quietly disappears from the count.

Task: write answer_shares(answers). answers is a list of strings, with None for a skipped question.

• Return a list of [answer, percent] pairs, one for each different answer.
• Skipped answers are counted together under the name "no answer". Only include that pair if at least one answer was skipped. No real answer is called "no answer".
• percent is the share of all entries in answers, skipped ones included, as a percentage rounded to 1 decimal place.
• Order the pairs by count, biggest first. If two pairs have the same count, put them in alphabetical order of their name ("no answer" sorts like any other name).
• If answers is empty, return an empty list.