fix: unpack status results differently

If we point inside a subdataset, repo.status will use the subdataset
path, and not the given path, as the key in the returned
dictionary. This would crash checks for paths leading into subdatasets
and is now fixed by simply taking the first value from the
dictionary (we ask about a single path, so there should be just one
status; an assertion is added just in case). Closes #15

datalad_redcap/utils.py

@@ -57,7 +57,8 @@ def check_ok_to_edit(filepath: Path, ds: Dataset) -> Tuple[bool, bool]:
         ok_to_edit = True
         unlock = False
     else:
-        st_fp = st[filepath]  # need to unpack
+        assert len(st) == 1
+        st_fp = next(iter(st.values()))
         if st_fp["type"] == "file" and st_fp["state"] == "clean":
             ok_to_edit = True
             unlock = False