Solve the programming task below in a Python markdown code block.
Given an array of integers.

Return an array, where the first element is the count of positives numbers and the second element is sum of negative numbers.

If the input array is empty or null, return an empty array.

# Example

For input `[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, -11, -12, -13, -14, -15]`, you should return `[10, -65]`.
Also feel free to reuse/extend the following starter code:
```python
def count_positives_sum_negatives(arr):
```