Interesting.  Can this be added to both clarify the intentional blank entry, and to demonstrate a feature of the grammar?  In contrast, slavic languages, which also make a distinction between animate and inanimate (but only for masculine nouns) and have several declensions, do in fact have a regular locative for animate nouns.  e.g. volk (wolf), v volke (in the wolf)  On the other hand, perhaps this becomes too detailed.  I suspect that some people might find this to be inappropriately boring and detailed to the general wikipedia reader.  I'm only suggesting this though because the table looks  a bit bizarre with a blank entry and with no explanation.