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Hmmm - sounds reasonable, but (linux, bash):$ X=$(ls xyyxyx 2>/dev/null)
$ echo $?, ">"$X"<"
2, ><
while $ X=""
$ echo $?, ">"$X"<"
0, ><
So the 2 would be the ls' exit status, wouldn't it?

Good you found a fix by yourself! Still, for e.g. later reference, these were the errors in your first script, which you did not correct but circumvent:
a) put the redirection inside the command...