Feature/internship (#3)

* Fixing sequence flow with conditions

* Adding support for Service Task and Send Task

* Updating README.md

* Update to Service and Send Task

* Adding CORS support for server

* Update Service Task for new keyword

* Adding functionalities for User Task

* Rewritten run_database_service

* Update requirements.txt

* Instance persistence solved

* Adding dummy db

* README update

* Adding dummy db

* Small convenience update

* Basic Call Activity implemented

* Update README

* Connector & Input/Output tab + Refactoring

* Basic DMN parser & execution

* Refactoring

* Formatting with Black

* Promjene u skladu s praksom

Co-authored-by: ssimic1144 <simic.sd63@gmail.com>

bpmn_types.py

@@ -226,12 +226,15 @@ def run_connector(self, variables, instance_id):
                 response = requests.patch(
                     self.properties_fields["db_location"], params=parameters, json=data
                 )
+
+        if response.status_code not in (200, 201):
+            raise Exception(response.text)
         # Check for output variables
         if self.output_variables:
+            r = response.json()
             for key in self.output_variables:
-                for r in response.json():
-                    if key in r:
-                        variables[key] = r[key]
+                if key in r:
+                    variables[key] = r[key]
 
     def run(self, variables, instance_id):
         if self.connector_fields["connector_id"] == "http-connector":