Non-Python kernel blocks fail on `org-edit-special` and `font-lock-fontify-block`

This is an awesome project. I tried running Haskell and Elixir kernels with success -- thank you.

Is it possible to get the babel source blocks to behave properly for non-Python kernels? `org-src-lang-modes` lists `("ipython" . python)`; I'm not sure if there's a way to put a function there that would lookup the `:kernel` header param. Or maybe some entirely different approach? org-src.el and ob-core.el seems to handle all the logic that's problematic.

As far as I can tell, `org-edit-src-code` (what org-edit-special calls) fails when it in-turn calls `org-babel-get-src-block-info`, which fails on `apply #'org-babel-merge-params` :

```
(apply #'org-babel-merge-params
(if inline org-babel-default-inline-header-args
org-babel-default-header-args)
(and (boundp lang-headers) (eval lang-headers t))
(append
;; If DATUM is provided, make sure we get node
;; properties applicable to its location within
;; the document.
(org-with-point-at (org-element-property :begin datum)
(org-babel-params-from-properties lang))
(mapcar #'org-babel-parse-header-arguments
(cons (org-element-property :parameters datum)
(org-element-property :header datum)))))
```
The above results in `"Wrong type argument: stringp"`. At first I thought this was because of `nil`s: the `append` produces

`(nil nil ((:session) (:kernel . "haskell") (:results) (:header . "haskell")))`.

Those particular `nil`s come from `(org-babel-params-from-properties lang)`, ie `(nil nil)`. However, the same occurs when the block's kernel is `python` with no issues.

The problem appears in `org-babel-merge-params`:
```
(`(:results . ,value)
(setq results (funcall merge
results-exclusive-groups
results
(split-string
(if (stringp value) value (eval value t))))))
```
but I'm not sure quite where in the function; my elisp-foo isn't sufficient to understand what's going on. The description of the function is
```
"Combine all parameter association lists in PLISTS.
Later elements of PLISTS override the values of previous elements.
This takes into account some special considerations for certain
parameters when merging lists."
```