artiq_dashboard: fix handling of moninj comment

artiq/dashboard/moninj.py

@@ -207,11 +207,10 @@ def setup_from_ddb(ddb):
     description = set()
 
     for k, v in ddb.items():
-        comment = None
-        if "comment" in v:
-            comment = v["comment"]
         try:
-            if isinstance(v, dict) and v["type"] == "local":
+            if isinstance(v, dict):
+                comment = v.get("comment")
+                if v["type"] == "local":
                     if k == "core":
                         core_addr = v["arguments"]["host"]
                     elif v["module"] == "artiq.coredevice.ttl":