IP AltsyncRam -- Read/Write operations issue

It's RAM. If you don't write anything to an address, then the contents of that address are undefined. That is how RAM has always worked. Modelsim is essentially telling you "Hey nothing has been written to this location!". In which case you'd most certainly better not be using the data.

As far as the dummy read/write cycle thing. That's not the best way to phrase it. There is a one clock latency minimum for reads. Writes are performed on the clock cycle where the command is presented.

Jake