[R] Filling empty List in a FOR LOOP

[michaelyb]

Basically I need to read the data from an external source using many R
commands.
The problem is that sometimes the source is empty, and I get a list with
empty values, and I need to substitute them by "NA".
It is def. not hard, I just don't see how....
In the prvious post, the first example had values on the source, but the
second example didn't....

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