fix: throw when temml output is not string

doerg/src/net/deertopia/doerg/tex/temml.clj

@@ -55,7 +55,11 @@
 (defn command-worker [x]
   (cbor/encode cbor/default-codec (:in *worker*) x)
   (.flush (:in *worker*))
-  (cbor/decode cbor/default-codec (:out *worker*)))
+  (let [r (cbor/decode cbor/default-codec (:out *worker*))]
+    (if (string? r)
+      r
+      (throw (ex-info "bad data from temml worker"
+                      {:data r})))))
 
 (defn render-inline [s]
   (command-worker s))