addNewBlock function does nothing if current block has length greater than 0

[fewebahr]

The addNewBlock function never adds a new block. If the current block has length 0, then it will merge the designated contents into the current block- but if the length is not 0, then no new block is added and the state is not updated.

The offending function is here:

I propose that we update the function so that addNewBlockAt is invoked if the current block has length greater than zero.

[brijeshb42]

Will you be able to submit a PR?