fix modify_unit split_to_array function

[ProditorMagnus]

Fixes some 3c63b1e issues.

[gfgtdf]

Thx what's the difference in the knwon_tags name? The GitHub diff does not not really show it.

[jyrkive]

@gfgtdf The word is written K-N-O-W-N. You had swapped the O and W.

[gfgtdf]

oh ok didn't see that at first.

Will merge it when I'm home, until someone else does it first