Compensating for NUL unicode characters

NUL characters are not allowed in text fields in the database

We used to strip them out of stdout but the exception changed

And we want to be sure to strip them out of JSONBlob fields

awx/main/fields.py

@@ -102,10 +102,22 @@ class JSONBlob(JSONField):
         if not prepared:
             value = self.get_prep_value(value)
         try:
-            return json.dumps(value)
+            # Null characters are not allowed in text fields and JSONBlobs are JSON data but saved as text
+            # So we want to make sure we strip out any null characters also note, these "should" be escaped by the dumps process:
+            #     >>> my_obj = { 'test': '\x00' }
+            #     >>> import json
+            #     >>> json.dumps(my_obj)
+            #     '{"test": "\\u0000"}'
+            # But just to be safe, lets remove them if they are there. \x00 and \u0000 are the same:
+            #     >>> string = "\x00"
+            #     >>> "\u0000" in string
+            #     True
+            dumped_value = json.dumps(value)
+            if "\x00" in dumped_value:
+                dumped_value = dumped_value.replace("\x00", '')
+            return dumped_value
         except Exception as e:
-            logger.error(f"Failed to dump JSONField {self.name}: {e}")
-            logger.error(f"{value}")
+            logger.error(f"Failed to dump JSONField {self.name}: {e} value: {value}")
 
         return value