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If the legislatures came up with none or only part of the total electors, then there may or may not be enough votes to to give one of the candidates 270, depending on the number of electors they picked.

depends...no state will want to be tagged as having no electors. If that should happen, then 270 is not the number.
the Constitution covers it...Article II, Section 1, and the 12th amendment:
"...The person having the greatest number of votes for President, shall be the President, if such number be a majority of the whole number of Electors appointed;..."

Let's say, PA does not have any electors appointed. Instead of 538, the count is now 518, so 260 would be the number. Biden still covers.

Now, what happens if PA has appointed electors but they are rejected by Congress during the count? Is the number 270? looks like it...Biden still covers...but who knows.