ctlmgr: do not raise exceptions in Controllers.__setitem__. Closes #1198

artiq/devices/ctlmgr.py

@@ -178,6 +178,7 @@ class Controllers:
                 raise ValueError
 
     def __setitem__(self, k, v):
+        try:
             if (isinstance(v, dict) and v["type"] == "controller" and
                     self.host_filter in get_ip_addresses(v["host"])):
                 v["command"] = v["command"].format(name=k,
@@ -185,6 +186,9 @@ class Controllers:
                                                    port=v["port"])
                 self.queue.put_nowait(("set", (k, v)))
                 self.active_or_queued.add(k)
+        except:
+            logger.error("Failed to process device database entry %s", k,
+                         exc_info=True)
 
     def __delitem__(self, k):
         if k in self.active_or_queued: