Add assertion to randrange that input is not 0

src/random.h

@@ -166,6 +166,7 @@ public:
     /** Generate a random integer in the range [0..range). */
     uint64_t randrange(uint64_t range) noexcept
     {
+        assert(range);
         --range;
         int bits = CountBits(range);
         while (true) {