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what if data we are sending is such that

size(data) + size(mac) =multiple of block size

If this case if possible how the receiver will determine that no padding is present ???

shefaligups11 Gups
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When the size of the data and mac is equal to a multiple of the block size, a complete block of padding is added. So in effect, there no TLS message that is not padded.

nobody
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    +1 for the succinct answer. If no padding was added in cases where the data+mac is equal to a multiple of the block size, then there would be no way for the recipient to distinguish this case from a padding error. – mti2935 Jul 31 '20 at 10:29