fix reference error

hyperglass/configuration/models/messages.py

@@ -79,6 +79,11 @@ class Messages(HyperglassModel):
         title="No Output",
         description="Displayed when hyperglass can connect to a device and execute a query, but the response is empty.",
     )
+    parsing_error: StrictStr = Field(
+        "An error occurred while parsing the query output.",
+        title="Parsing Error",
+        description="Displayed when hyperglass can connect to a device and execute a query, but the response cannot be parsed.",
+    )
 
     class Config:
         """Pydantic model configuration."""

hyperglass/execution/execute.py

@@ -82,6 +82,7 @@ class Connect:
         """
         log.debug(f"Pre-parsed responses:\n{output}")
         parsed = ()
+        response = None
         if not self.device.structured_output:
             for coro in parsers:
                 for response in output:
@@ -96,6 +97,8 @@ class Connect:
             func = nos_parsers[self.device.nos][self.query_type]
             response = func(output)
         log.debug(f"Post-parsed responses:\n{response}")
+        if response is None:
+            raise ResponseEmpty(params.messages.parsing_error)
         return response
 
     async def scrape_proxied(self):