fixed a division by zero if the blocksize of the bigintger to byte array requests a length blocksize

Author: ic0ns

src/main/java/de/rub/nds/modifiablevariable/util/ArrayConverter.java

@@ -276,6 +276,10 @@ public static void makeArrayNonZero(final byte[] array) {
      * @return big integer represented in bytes, padded to a specific block size
      */
     public static byte[] bigIntegerToByteArray(BigInteger value, int blockSize, boolean removeSignByte) {
+        if(blockSize == 0)
+        {
+            return new byte[0];
+        }
         byte[] array = value.toByteArray();
         int remainder = array.length % blockSize;
         byte[] result = array;