Return size 0 for NULL array, correct for min/max in spatial grid

engine/breeze/util/array.c

@@ -28,6 +28,7 @@ void _bzArrayClear(void *arr) {
 }
 
 i32 _bzArraySize(void *arr) {
+    if (arr == NULL) return 0;
     return ARRAY_HEAD(arr)->size;
 }
 i32 _bzArrayCapacity(void *arr) {