Given a list of integers, find the element that appears most frequently. If two elements appear the same number of times, return the smaller of the two. Return null for null or empty input.
Examples:
Input: nums = [1, 2, 2, 3]
Output: 2
Explanation: 2 appears twice, which is more than any other element
Input: nums = [1, 1, 2, 2]
Output: 1
Explanation: Both 1 and 2 appear twice; return the smaller element, 1
Input: nums = [5]
Output: 5
Explanation: Only one element in the list, return it
Input: nums = [3, 3, 3, 1]
Output: 3
Explanation: 3 appears three times, more than 1
Input: nums = null
Output: null
Explanation: Null input returns null
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