ArraySort(): Fix bound checking bug.

Closes #31.

CHANGELOG.md

@@ -19,6 +19,8 @@ are not even initialized to a default value.
   specific circumstances.
 - Added `JsonMerge()` to the JSON API to merge two JSON objects together.
 - Make `HttpRouter` decode path parts before matching them on regular expressions.
+- Fixed a bug in `ArraySort()` that would crash programs if the passed array has no
+  elements.
 
 ## v0.4.0
 

src/Array.c

@@ -267,8 +267,9 @@ ArrayQuickSort(Array * array, size_t low, size_t high, int (*compare) (void *, v
 void
 ArraySort(Array * array, int (*compare) (void *, void *))
 {
-    if (!array)
+    if (!ArraySize(array))
     {
+        // If a NULL ptr was given, or the array has no elements, do nothing.
         return;
     }
     ArrayQuickSort(array, 0, array->size - 1, compare);