imager bug if object_date is not set

flows/main.json

@@ -7918,5 +7918,30 @@
             [],
             []
         ]
+    },
+    {
+        "id": "2dc762df.08cd7e",
+        "type": "inject",
+        "z": "baa1e3d9.cb29d",
+        "name": "Default: 0.01",
+        "props": [
+            {
+                "p": "payload"
+            }
+        ],
+        "repeat": "",
+        "crontab": "",
+        "once": true,
+        "onceDelay": 0.1,
+        "topic": "",
+        "payload": "0.05",
+        "payloadType": "num",
+        "x": 310,
+        "y": 320,
+        "wires": [
+            [
+                "df1ea904.cd261"
+            ]
+        ]
     }
 ]

scripts/planktoscope/imager.py

@@ -581,6 +581,20 @@ class ImagerProcess(multiprocessing.Process):
         # Concat the local metadata and the metadata from Node-RED
         self.__global_metadata = {**self.__global_metadata, **local_metadata}
 
+        if "object_date" not in self.__global_metadata:
+            # If this path exists, then ids are reused when they should not
+            logger.error(f"The metadata did not contain object_date!")
+            self.imager_client.client.publish(
+                "status/imager",
+                '{"status":"Configuration update error: object_date is missing!"}',
+            )
+            # Reset the counter to 0
+            self.__img_done = 0
+            # Change state towards stop
+            self.__imager.change(planktoscope.imager_state_machine.Stop)
+            planktoscope.light.error()
+            return
+
         logger.info("Setting up the directory structure for storing the pictures")
         self.__export_path = os.path.join(
             self.__base_path,