Calculate the sum of all even numbers in a list. Return 0 if the list is empty or null.

Examples:

Input: numbers = [1, 2, 3, 4, 5, 6] Output: 12 Explanation: Even numbers are 2, 4, and 6. Their sum is 12 Input: numbers = [1, 3, 5, 7] Output: 0 Explanation: No even numbers in the list, return 0 Input: numbers = [2, 2, 2, 2] Output: 8 Explanation: All numbers are even, sum them all
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