Given a list of integers, find the majority element - the element that appears more than half the time (more than n/2 times where n is the list size). If no majority element exists, return null. Return null for null or empty input.
Examples:
Input: nums = [3, 3, 4, 2, 3, 3, 3]
Output: 3
Explanation: 3 appears 5 times out of 7, which is more than 3 (7/2)
Input: nums = [1, 2, 3]
Output: null
Explanation: No element appears more than 1 time, need more than 1 (3/2)
Input: nums = [7]
Output: 7
Explanation: Single element is always the majority
Input: nums = null
Output: null
Explanation: Null input returns null
Input: nums = []
Output: null
Explanation: Empty list returns null
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