fix(itim): Correct config that is in the incorrect format

Users can input config that contains bytecode chars which inturn, makes the config entered a str. convert any config that is a str to a dict, the correct format.

ref: #851 fixes #850

app/itim/models/clusters.py

@@ -1,3 +1,5 @@
+import json
+
 from django.contrib.auth.models import User
 from django.db import models
 from django.db.models.signals import post_delete
@@ -355,6 +357,10 @@ class Cluster(TenancyObject):
 
         if self.config:
 
+            if isinstance(self.config, str):
+                self.config = json.loads(self.config)
+                self.save()
+
             rendered_config.update(
                 self.config
             )