Dealing with bad error response from Hive RPC

Adding some logic to stop this response from Hive bringing down the hivewriter.

```
  File "/home/podping/app/.venv/lib/pypy3.8/site-packages/lighthive/client.py", line 167, in validate_response
    raw_body=response,
lighthive.exceptions.RPCNodeException: Internal Error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/podping/app/src/podping_hivewriter/podping_hivewriter.py", line 495, in failure_retry
    ex.raw_body["error"]["data"]["name"]
KeyError: 'name'
```

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "podping-hivewriter"
-version = "1.2.4"
+version = "1.2.5"
 license = "MIT"
 authors = ["Alecks Gates <[email protected]>", "Brian of London <[email protected]>"]
 maintainers = ["Alecks Gates <[email protected]>", "Brian of London <[email protected]>"]

src/podping_hivewriter/podping_hivewriter.py

@@ -491,25 +491,33 @@ async def failure_retry(
             except RPCNodeException as ex:
                 logging.exception(f"Failed to send {len(iri_set)} IRIs")
                 try:
+                    # Test if we have a well formed Hive error message
+                    logging.exception(ex)
                     if (
-                        ex.raw_body["error"]["data"]["name"]
-                        == "tx_missing_posting_auth"
+                        ex.raw_body.get("error")
+                        and ex.raw_body["error"].get("data")
+                        and ex.raw_body["error"]["data"].get("name")
                     ):
-                        if logging.DEBUG >= logging.root.level:
-                            for iri in iri_set:
-                                logging.debug(iri)
-                        logging.error(
-                            f"Terminating: exit code: "
-                            f"{STARTUP_FAILED_INVALID_POSTING_KEY_EXIT_CODE}"
-                        )
-                        sys.exit(STARTUP_FAILED_INVALID_POSTING_KEY_EXIT_CODE)
+                        if (
+                            ex.raw_body["error"]["data"]["name"]
+                            == "tx_missing_posting_auth"
+                        ):
+                            if logging.DEBUG >= logging.root.level:
+                                for iri in iri_set:
+                                    logging.debug(iri)
+                            logging.error(
+                                f"Terminating: exit code: "
+                                f"{STARTUP_FAILED_INVALID_POSTING_KEY_EXIT_CODE}"
+                            )
+                            sys.exit(STARTUP_FAILED_INVALID_POSTING_KEY_EXIT_CODE)
                 except Exception:
                     logging.info(f"Current node: {self.lighthive_client.current_node}")
                     logging.info(self.lighthive_client.nodes)
                     logging.exception("Unexpected condition in error text from Hive")
                     sys.exit(STARTUP_FAILED_UNKNOWN_EXIT_CODE)
 
             except Exception as ex:
+                logging.exception(ex)
                 logging.exception(f"Failed to send {len(iri_set)} IRIs")
                 if logging.DEBUG >= logging.root.level:
                     for iri in iri_set: